JDMZ28

iTrader: (1)

My 86' camaro gets 19mpg in the city and 27mpg on the freeway. That's with 3.73 gears and a holley DP. I think it's running a little rich too.

My 87' stock, tpi, 305, auto, 273, T/A only gets 16mpg. What the heck?

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1986 CAMARO Z28 ->
151,000 original miles, 43,000 on 89' vette 350 block, Holley 650 DP, Weiand intake, 1.6 rockers, 1 5/8" headers, no cat, 2 1/2" Flowmaster catback, Mallory coil, March pulleys, B&M Ripper shifter, T5 with 3.35 1st gear and 0 miles, 90% Centerforce clutch, 3.73 posi, Eibach 1" drop springs, Spohn LCA's, Spohn adjustable panhard rod, Subframe connectors, all bushings are urethane, 2 12" Sound Streams, 2 Infinity 6X9's, 2 Pioneer 6X9's, 800 watt Lanzar Vibe amp. ET 13.22@ 106.4MPH 3300lbs less driver and speakers Next mods-> Extreme Energy 268 cam, Holley street dom intake.

1987 TRANS AM ->
73,000 miles, 305TPI, auto, gutted air box.

ColinOpseth

i get 19 town, 24fwy with my bone stock '87 IROC with only mods being a flowmaster 3" catback..

my mileage probably sucks a bit from my cat being burned (burned it when my knock sensor came unplugged) so i should probably be 2-3mpg better than what i'm seeing now..

this is with base timing set at 6BTDC running 87 octane cruising at 70mph in OD... my car is a G92 car so i should have the 3.27 gears, turning 2200rpm at 70

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Webmaster: www.IROC-Z.org

TTA

Never checked in Town but Highway I got almost 26mpg on a 1000 mile trip cruising 80-85. Gootta love 3.27 Gears

------------------
Mike
1989 Turbo Trans-Am
11.25@121.25
Daily Driver

1998 Trans-Am LS1 6 Speed
13.10@106
Slow POS sitting in the Driveway awaiting repairs and then its For Sale. No More V8 Cars for me.

Ward

iTrader: (1)

Mileage? What the hell is that?

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1983 Firebird
TH700R4 Auto
Small Block 400
LG4 ECM, Intake, Carb, Distributor, etc.
Soon to be non-computer.
Clarion Head Unit 45X4
2 Pioneer 400W 12" Subs
Third Gen Performance
"A four cylinder is half an engine."

Big John's 86

New to this board. My beater Cutlass gets 10-15 twn/hwy if I keep my foot out of it. So I figure about 5mpg.

------------------
'86 G-body Cutlass
Olds 307/TH350
Soon to be 377/700R4
To Beer or, not to Beer...

fb305svs

hmm cool to know my milage wont completely die when i go 373's

right now withthe 273's i get about 17-18 in town, and i got 42 on my trip back from the race track. gotta love coming down hills in neutral to save a little gass hehe.

thats a car with 165k on it by the way- i luv my bird!

------------------
86 Firebird, LG4, t-tops, 2.73 open rear, SLP 3 inch cat back exhaust, catco cat, 1inch carb spacer.

Current Plans: 342 posi disk 10 bolt rear, rebuilt/fixed up tranny with a trans go shift kit, vette servo, and some other goodies...,cowl induction hood, lowering springs, sfc, and new formula wheels, and tires.
Hopeful list- mild 350, headers, and a t56

My Webpage- Battle of the birds, My own Thirdgen Page, still under construction, http://www.geocities.com/soares711/index.htm

88 Firebird Formula- deseased 2/9/99- 305 TPI, SLP 3 inch exhaust, SLP Intake runners, SLP cam, 3.45 BW disc brake posi, WS6, NOS, and all that good stuff, 13.8 on the motor, 12.89 on NOS and slicks! Hit by what else!?!? a FORD EXPLORER!!!!!!

Bort62

Uh yeah, I get about 13.5 highway/city combined.




------------------
60 Ranchero - Project ( Money Hole )
85 Sport Coupe LG4 - Daily Driver

Just another Hot Rod kid, or thats what they all tell me.
Livin' the Stereotype

nestz28

iTrader: (1)

I get about 16 city and 30 highway if I'm not pushing it.

nestz28

iTrader: (1)

I get about 16 city and 30 highway if I'm not pushing it.

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'84 Z28 LG4 T-5
'92 Z28 wheels
153,000 miles
Front& rear suspension rebuild using MOOG parts
350 and WC coming in summer 2001
'70 nova 307, th350, all stock, 40,000 mi almost like new

87 Trans Am TPI

You guys are lucky, I average 12-14 around home, highway no more then 17 or 18.

------------------
1987 Trans Am
5.0L TPI
Automatic, all pwr. op
Digital Dash
Flowmaster Muffler
gutted cat
removed MAF screens
TransGo Shift Kit

Mkos1980

iTrader: (8)

About 20

theformula

When I drive like a normal law abiding citizen, I get around 26mpg on the highway. Gotta love highway mode

I'll be ditching the 3:73s soon, I hate them. Back to the original 3:42s. Yes your gas mileage will suffer with 3:73s.

------------------
91 Formula 1LE 1 of 46
305 TPI 5speed
1LE/G92/WS6

Paxton SN92 supercharger, Ford SVO 24#injectors, Crane AFPR,SLP airfoil, ported/polished plenum, March alt. pulley,Crane Gold 1.6rrs,MSD coil,MSD6AL (5400rpm limit),Holley 9mm wires,Ac delco R43ts plugs,custom chip,Bosch O2sensor,SLP 1 5/8" headers,SLP catback,shortened shifter,3:73s w/Auburn posi,180* t-stat,JET 195* fan switch, Macewen white face gauges, Autometer gauges, Zoom hi-performance clutch.

[This message has been edited by theformula (edited April 25, 2001).]

chris1roc

about 16 city for me.

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88 iroc
LB9 305 tpi
k&N, flowmaster, ADS chip
160* thermostat
home made ram air
removed smog pump
TB bypass
ASCD big block hood

AIM - chris1roc

Formula-91

I'm guessing around 10 if I stay out of the throttle. If I feel like playing, it drops to around 6.

------------------
91 Firebird Formula. Converted to carb. Holley 750. Forged Flat top pistons. 10.5 to 1 compression. ZZ-9 Cam. Ported L98 Heads.
175 shot NOS, 700r4 w/ 3000 rpm converter and 3.73s in the back. Headers w/ full dual exhaust. 27.5 inch McCrearys.
12.98 @ 106 Natural,
11.83 @ 113 NOS.

Rob P

iTrader: (1)

92 Z28 convt 5spd 3:08 posi rear, hollow cat, dynomax cat back, ported intake/plenum/runners.
25.6mpg on my recent trip to Key West running between 80-90mph.
My big block Impala got 13mpg this tank full, whoohooo! Up from 10 before the intake swap.

------------------
Rob P
89RSconvtZZ4TPI
Edelbrock Hi-Flow Intake
SLP Dual Cold Air Intake
1 5/8" Headers
Semi-Siamesed Runners
MSD6AL/relocated MAT/ AdjFPR/IROC frnt@rear swaybar/wonderbar/steeringbox/alum drvshaft/ Alston SFC/3:23posi disc rear/MAC LCA/H.Adams Panhard Rod/KYB struts/ shocks/
92Z28convt5spd
71Impala convt 402BB
BETTER DRIVING THRU SUPERIOR HORSEPOWER!

jms

iTrader: (1)

Recently tuned my GTA 5.7 and built a ****pit adjustable cold air/ram air system and a few other simple mods. The car has Edelbrock headers and cat-back, no cat (don't tell), 1.6 roller-tip rockers, 3-angle valve job, 3.27 rear and a few other free mods.

Over the weekend, I took a "mileage check" trip and got 30 m.p.g.

Except at stops, never under 55 mph and never over 62 in hilly,curvey country.

On the way back, went over 100 mph twice and 120 once and averaged a pitiful 29.6 mpg. ALTHOUGH that tank did include several miles of intown 30-40 mph driving.

By the way, the ram-air really perked the car up above 85 mph.
jms

jms

iTrader: (1)

Well,
The message censor blanked out my driver's c/o/c/k/p/i/t term.

OK.

Might as well add the car is an '88 GTA and can been seen, through the end of April, on the opening page at www.kyfbodies.org.
jms

soulbounder

Just made 21+ mpg city/highway driving on my last tank.

rezinn

How would your cat being burned cause you to get bad gas mileage? The cat only acts as a catalyst for reactions in the exhaust, after fuel has been burned. Not to flame, am I missing something?

David M

13-14mpg around town on a stock '84 H.O. Z28 with 3.73 gears and an automatic trans. Is this normal for these cars?

91RSconv

Get this, my slightly modded 91 rs convert went 133 miles on the first quarter of the tank! I Set the cruise to 70mph and watch as I hit 400 miles on a single tank!

------------------
91' red RS convert.
71,000 miles
89' IROC hood
red Z-28 16" rims
potenza re730's
MSD ignition
MSD coil
K&N fiter
350 ported polished heads
hypertech chip
flowmaster 40 series cat-back

dwhess504

crappy........ But I just got out of a toyota LOL.

------------------
1988 Trans am GTA
stock, only mods:
flowmaster exaust.
in process of getting more

merf23

400 miles out of a tank!!!!!
I was excited when i got 260.

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1984 Z28 (L69) monochrome tangerine orange with IROC decals and hood
1987 IROC wheels with Goodyear GSC's
305 from 87 IROC with 1994 LT1 cam (203/208 .450/.460")
performer intake
Qjet from 73 Olds
dynomax cat-back, gutted cat
no emissions controls --> passed emissions testing
non WC T-5 with 0.73 5th
3.27 nine-bolt

CamaroZ_85

lol 260??? try 180...that sucks!!! when you divide that by 16 gallons i get 15 mpg and i cant complain, but after that tank, i filled up (from nearly dry) and it put like 12 gallons in...i thought we were 16 gallons...or am I wrong??? anyway, w/ the 12 gallons, it comes to about 12 mpg mixed driving. thats terible lol highway is much better, dont know off hand. btw I'm on it all the time im sure that doesnt help

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85 Z28- 350, Comp 262, Edelbrock Performer intake, Edelbrock 600 cfm carb and Edelbrock cat back, Summit headers and vette servo
-JVC, Eclipse, Pioneer, MTX, Phoenix Gold, Planet Audio

idrag2

I drive my car like it needs to be drove and I get around 7 city\highway

I DRAG 2

ZDADDY92

I got 26 last roadtrip. Taking another tommorrow, let ya know when I get back-

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92 Z-28
305 -5speed
160 thermo.
K&N Air Filters
B&M Ripper
14.7 @ 96mph (stock run)

91-GasGuzlinZ-28

I get about 10-12 mpg in the city and about 14-17 on the highway.

------------------

• Red '91 Z-28 350
• 700-R4 Trans
• T-tops
• no major power
  gaining mods, K&N
  Filter, Flowmaster
  exhaust -series 80-,
  exhaust cut-outs
• Best E.T. 15.0@93mph, Will improve that 1/4 mile time this spring.
• HardlinePerformance

jaretz28

I'm too scared to even think about it. Only look at my odometer to remember when to change the oil.

GTA88

I am envious of those guys getting 26 highway. The best I ever got was 22 highway. City must be around 16. No mods.

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88 GTA Charcoal Grey Bone Stock except for loose muffler which makes it a bit louder than normal.

88'camaro305TBI

iTrader: (2)

JDMz28, how do you get such good gasmilage? that is almost impossible.

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Pat Hirsz
www.iit.edu/~hirspat/MyPage2.htm
88 305TBI
Mods:Hooker Aerochamber 3" exhaust, gutted kitty, March pullies, no smog, 180 thermo,
14x4 K&N, 3.42 gears(open), Ultimate TBI Mods,AFPR,MSD(ignition,coil&wires),Edelbrock TBI Manifold, 195ltr/hr fuel pump,
Eibach springs with KYB's all around,
Harwood cowl hood, Z-28 wing, fresh paint(black)
120,000 miles, 5spd, T-tops,slp headers on its way

92 RS, 305TBI, auto, 3.08 gears, 180 thermo, glasspack (no muffler)

Slow83Z28Camaro

i just got 100 miles on a quater tank, i was so happy when i saw that i thought the car was gona eat a half tank from that trip, but i was racin a car to a certain point on the trip

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80 series flowmaster,8.8, 2.5 in exuast plug wires, accel super coil,accel distriburator, 650 holly n a polished elderbrock rpm performer comin soon

vortech305

i get 28miles in the city and 39 in the highway

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92' camaro
New 305 block TPI conversion, Flat top pistons,Bore over .30 Forged parts all around,Edelbrock intake,ported plennum,ported corvette alluminum heads, accel cam,52mm throttle bodie, SLP runners Home aid cold air induction, Air foil,ford SVO 19lb injectors,fuel regulator,cloys timing chain, comp alluminum roller rocker arms and pushrods MSD 8.5 mm wires, bosch plattinum plugs, hypertech cap & rotor and coil, Edelbrock TES headers, free flowing catalytic converter and a 3 inch force II flowmaster exhaust system, and a 3 inch cutout,Zoom multi friction clutch, T-5 tranny,billenstien shocks&struts.
Soon to come!!!
Procharger system 12lbs o boost.
New paint job(hawaiin orchid purple)Cast alluminum ZR1 rims w/ 275 tires.
Favorite quote: "where ever u go, there u are"

Other car;
1971 plymouth Duster
Mods:340,edelbrock victor jr. intake, 650 4 barrel holley, heddman headers,40 series dual flowmasters, cold air intake,4:10 gears, just got a new paint job and cragar rims with 315 tires in the back.
:Yeah its not a chevy but damn how many 71' dusters have u seen in the streets.

ImportEater

What? Has someone been smoking their crack today? Maybe in your rice-mobile.


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1985 Trans Am - rough and ready
1976 Corvette Stingray - not so rough, but always ready

JDMZ28

iTrader: (1)

The reason, I think, I get such good mileage is because my car has such good throttle response. I have my timing set really high, with a coil and wires. I also have a spreadbore carb, no emissions, cam with 116 lobe sep. and a big overdrive.

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1986 CAMARO Z28 ->
151,000 original miles, 43,000 on 89' vette 350 block, Holley 650 DP, Weiand intake, 1.6 rockers, 1 5/8" headers, no cat, 2 1/2" Flowmaster catback, Mallory coil, March pulleys, B&M Ripper shifter, T5 with 3.35 1st gear and 0 miles, 90% Centerforce clutch, 3.73 posi, Eibach 1" drop springs, Spohn LCA's, Spohn adjustable panhard rod, Subframe connectors, all bushings are urethane, 2 12" Sound Streams, 2 Infinity 6X9's, 2 Pioneer 6X9's, 800 watt Lanzar Vibe amp. ET 13.32@ 106.4MPH 3300lbs less driver and speakers Next mods-> Extreme Energy 268 cam, Holley street dom intake, ported heads.

1987 TRANS AM ->
73,000 miles, 305TPI, auto, gutted air box, gutted cat.

406 S10 Man

iTrader: (1)

you guys are getting way better mileage than me (for the most part). i can't be sure because i need a cable for my speedo, but i think i'm getting around 8 mpg. that is mostly around town, but not much stop n go. and only a few burnouts, too, maybe one or two.

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88 S10
Dropped 3/4
18" Boyd Coddington Timeless 5s
406 balanced with 6" Eagle H-beam rods, 10.25:1 JE SRP pistons, Comp 284XE cam; 240/246 @.050, .507/.510, Dart 200cc Ironeagle heads, Victor Jr. intake, Holley 750 vac sec.
12.20 @ 115.25 mph

Sandy Mandel

Lately, after my last 3 tanks, I averaged about 18 1/3 mpg combined. I do about 50/50 type driving and I like using the power to get onto the highway. So, I'm sure I'm lowering my mileage by doing that. Anyway, see below to see how I'm equipt...

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1986 IROC-Z28 L98 TPI BW WC T-5
Air Foil
K & N
Custom Ram/Cold Air Induction
Koni Gas Shocks
Spohn LCAs and PHrod
Art Houser/Moser 3.73:1 Torsen Diff
Amsoil lubes and oil filter
Flash to Pass feature & 100w Euro lighting
Recaro Driving seat
Hurst Comp + shifter
Random Tech SHF cat

JDMZ28

iTrader: (1)

<sandy> 18 mpg sounds about right for your car. If I were you I'd get a high discharge coil. That would probably up your mileage to 19 even. Was that a list of all your mods? If it is you should get a chip and a muffler also.

<all yall> Yeah I drive my car like a nut too, I have the timing adjusted very well so I barely have to press the gas to get a mouth full of torque and I'm disappointed when I don't get 20 miles per gallon city.

------------------
1986 CAMARO Z28 -&gt;
151,000 original miles, 43,000 on 89' vette 350 block, Holley 650 DP, Weiand intake, 1.6 rockers, 1 5/8" headers, no cat, 2 1/2" Flowmaster catback, Mallory coil, March pulleys, B&M Ripper shifter, T5 with 3.35 1st gear and 0 miles, 90% Centerforce clutch, 3.73 posi, Eibach 1" drop springs, Spohn LCA's, Spohn adjustable panhard rod, Subframe connectors, all bushings are urethane, 2 12" Sound Streams, 2 Infinity 6X9's, 2 Pioneer 6X9's, 800 watt Lanzar Vibe amp. ET 13.32@ 106.4MPH 3300lbs less driver and speakers Next mods-&gt; Extreme Energy 268 cam, Holley street dom intake, ported heads.

1987 TRANS AM -&gt;
73,000 miles, 305TPI, auto, gutted air box, gutted cat.

Christos

I get around 9-11 MPG in m stock 1986 IROC Camaro. I think it has something to do with the comptuer, and my o2 sensor.

Ill post on this thread in a week once i take my car in for repairs.



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1986 IROC Camaro
305 TPI "LB9"
3.23 gears
Doesn't know enough about cars.
AIM: jesusathome

evilho7810

Why do people lie about their gas mileadge so much? Do you guys think it makes you look better or something? I can get almost 24 highway if I never pass 2K on the tach it's more like 20 with normal driving. 27 with a carb, Bullsh)t no way. 42mpg Haha no way I don't care if you idled down hill the whole way. I know you can get better mileadge with a prom and highway mode but how many of actually have that. All you guys claiming 30+mpg come by my house and if you get that good of gas mileadge i'll buy you a tank of gas, and if you can't I want a tank of gas.

JPrevost

27mpg with 350 TBI on highway, probably half that in city (damn lights every 2 blocks!!!!)

------------------
, Jon (350 TBI!)
91 Red My website

jms

iTrader: (1)

Get that free gas ready.

Ask around and see what the factory mileage rating was for the TPI cars. I believe the 1988 GTA 5.7 (like mine) was 24, 25 or 26 highway.

My car has no cat, no smog pump, Edelbrock Jet Hot-coated headers, full 3" Edelbrock exhaust, fully ported plenum, TB bypass, Wells SU145 Mass Air Flow Sensor, pocket ported L98 heads, 1.6 ratio roller-tipped Comp rockers, home-made driver c-o-c-k-p-i-t (hate having the board censor) adjustable ram-air made up with 4" tubing, relocated charcoal cannister, K & N cone shaped filter and larger 3" intake tract tubing, adjustable fuel pressure regulator and fuel gauge, Mobil One oil and more.

The car has Pep Boys Ultra Zs 245-50-16s on front and 255-50-16s on the rear, inflated to 32 psi all-around. Correctly lined front-end, no loose parts.

I've run this car at Beech Bend (Bowling Green, KY), at full weight, no taking out stuff, and hit a best of 14.06 at 99.5 mph but average about 14.1xs.

I have seen 30 m.p.g., in hilly-curvey south-central Kentucky on narrow, unsmooth two lane roads, running between 55 and 62 mph.

I've seen 18 m.p.g. after driving 60 miles to the track, making several runs, then driving back home.

Overall, I start checking things if the normal mileage drops under 24 mpg. I check my timing regularly, my TPS,etc. etc.

You may think I can't get 30 m.p.g., but you would be wrong. I believe, if I tried the 'tricks' to get better mileage, I could see 32 or 33 m.p.g.

If the factory highway ratings are 24, 25 or 26 m.p.g., what makes you think all the work I've done to increase my car's efficiency won't help the mileage?

Afterall, if you burn the gas properly, you have more power and better mileage (except when you get into race set-ups and I can talk those too. Been involved in that scene since the early 1970s).

These cars are sensitive to tune-ups and since most of these cars are getting 'long-in-the-tooth', they are probably in the hands of their third, fourth, or fifth owners, who, in all likelyhood, are young and new to the auto world and don't keep the car at tip-top-condition. Not all, but quite a few of them.

You don't have to be an old geezer like me (45-I can't be 45) to keep your car in shape but these cars are easy to fall out of tune at their age.

I'll conclude by saying that if someone has a mostly stock TPI car (305 or 350) and isn't getting at least 22-24 m.p.g. highway mileage, then there car is out of tune and needs to be looked into.
jms

AJ_92RS

I used to get 20-22 highway/city. But then I gave it a tune up, put in the chip, t-stat, fan switch, and changed the O2 sensor. After that I got 12-13 mpg. I later checked the timing. Even though the book I had said not to mess with it, I did. But not until I read on here how to do it. It was 3 deg ATDC. I put it at 4 deg. BTDC, but have not ran a tank out of it yet. I am anxious to find out. Trying to keep my foot out of it.


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92 RS w/t-tops 305 TBI Auto.
170K miles and don't burn a drop o'oil
-K&N Truck filter #1500 w, open ele.
air cleaner
-Dynomax 2 1/2" cat-back
-B&M TransPak
-Jet Stage2 Chip
-180* T-Stat w/ 185* Fan Switch
-JVC CD--Alpine speakers & 4ch. amp
Rockford 2ch. to 2 MTX 12" subs

82camaro

I get at best 20 usually 14. But, I saw some posts about getting alot of miles on a quarter of a tank. The guage isn't that accurate. The first quarter of a tank I get about 29 mpg, but the last quarter I get about 10. For accurate mileage it really should be more than one tank. How can you tell if you filled it up the same exact amount. Most people don't worry about that and get it to the nearest dollar amount. After 10-15 tanks, it starts to average out and become more accurate.

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82 camaro--original steering wheel, brake/gas pedals, seats--everything else modified
82camaro

JDMZ28

iTrader: (1)

I don't really care what you think about gas mileage dude, having your little doubts about my mileage makes no difference to me. I have no reason to lie I'm paying the gas bill. Try reading a few books about what makes a well matched system and do it for yourself. It's amazing what a little knowledge will do.

But to the people who actually know how to do it smart and tune their engine properly. I get about 21 average but on the freeway I get just about 26-27. The trick is a high output ignition system with a good amount of ignition advance along with a bunch of bolt-ons like headers and stuff. The part throttle torque is amazing. I'm not putting a cam in my car just because I want good mileage through college.

Let's see, how to check your gas mileage........this is a hard one. Gas mileage 101. You fill the tank to full, set your trip to 0 (or use your handy little number recorder on the over head console), drive until your almost empty, fill the tank back up, then divid your miles by gallons required to fill the tank again. Tada you now have your average gas mileage.

------------------
1986 CAMARO Z28 -&gt;
151,000 original miles, 43,000 on 89' vette 350 block, Holley 650 DP, Weiand intake, 1.6 rockers, 1 5/8" headers, no cat, 2 1/2" Flowmaster catback, Mallory coil, March pulleys, B&M Ripper shifter, T5 with 3.35 1st gear and 0 miles, 90% Centerforce clutch, 3.73 posi, Eibach 1" drop springs, Spohn LCA's, Spohn adjustable panhard rod, Subframe connectors, all bushings are urethane, 2 12" Sound Streams, 2 Infinity 6X9's, 2 Pioneer 6X9's, 800 watt Lanzar Vibe amp. ET 13.32@ 106.4MPH 3300lbs less driver and speakers Next mods-&gt; Extreme Energy 268 cam, Holley street dom intake, ported heads.

1987 TRANS AM -&gt;
73,000 miles, 305TPI, auto, gutted air box, gutted cat.

Arctic White 91 RS

I bought my RS new and am the original owner. My 305 TBI was rated at 19mpg city and 26 mpg highway. When the car was new 29mpg on the highway was easy to get. I've taken care of the car and tuned and at 221,833 miles on the odometer, it still gets 29 mpg with ease on the highway. The car's best is 31.5 mpg My disbeliving friends have been along for 400+ miles road trips and were stunned with disbelief when the numbers were crunched before their eyes. If my car had headers, better Y pipe, better cat and high energy coil, I'm sure the RS could have gotten into the mid 30's or higher. 210,000+ miles the car dyno 133hp and 220 torque. The emissions were 5 ppm, my new LS1 T/A had 7ppm, both were tested by the same shop. No engine or tranny work either.

As someone else said, if the your 3rd Gen's mpg is low, it needs a tune up, alignment, coil/wires etc.

Don't belive, I couldn't careless.

Fred85TA

I don't keep track of the two separately. Living in north Texas, there's a lot of highway/city driving being practically the same thing. Anyway, I get 16 mpg altogether.

Fred85TA

I don't keep track of the two separately. Living in north Texas, there's a lot of highway/city driving being practically the same thing. Anyway, I get 16 mpg altogether.

------------------
91 TA 5.7 TPI Automatic.
w/WS6 and 3.23 rear.
K&N Air Filter,Hypertech Coil,Moroso Blue Max Wires, Bosch Platinum plugs gapped at .050,
JET fan switch,JET air foil,Dual cats with Flowmaster 3" exhaust (Headers coming soon),
Complete PST components on front suspension, Spohn LCAs/Panhard bar.
It's not much, but it's a start and I have a Summit catalog! :-)

evilho7810

You guys have some super cars or something i've never seen a thirdgen (I've owned 2 and a 4th gen) get better than 25 (I got 26 once in the 4th gen) and that was being very grandpa-like. My taurus doesn't even get 30mpg on the highway. Mabey because I live in the city my gas mileadge isn't as good either. On my 89 iroc 350 tpi auto i've had an msd ignition, cap, coil, wires, and ac delco rapid fire plugs so if my ignition wasn't high output enough i'd like to know what is. Couldn't get anywhere near 30mpg never had headers though. What are your secrets? Please tell us.

jms

iTrader: (1)

A general consensus is that of the power available in a gallon of gasoline, 80% is wasted. Out the tailpipe, the radiator, the rotating friction in an engine, driveline losses, etc.

Those numbers are best case scenario.

If you can get above that 20% efficiency, you pick up power as well as better fuel mileage (up to a point when you start having big duration cams, high flow, high rpm heads, etc).

Most everyone on these boards would agree headers help power. Well, if you can keep your foot out of that new found power (and the sound) and drive "sanely" your mileage should go up. Keep in mind an entire free-flowing type exhaust has to be in place. Headers with a clogged cat gets you nowhere.

Most everyone (and there is some debate) agree that roller tip (or full roller) rockers help power. That is because they reduce friction.

As has been said many times on this board, the TPI cars tend to run a little rich. Therefore, if you can get more air into the engine to go with that fuel, you get more power. There are many ways to get more air in. Search these boards. No need to list them here.

A front-end that is out of line will not only wear out your front tires, it kills your mileage. For an easy test, roll a tire normally, then turn it sideways and try to push it sideways. That is what an out-of-line front-end does. Pushes your tires crossways down the road. Low air pressure also hurts mileage. Soft rubber tires grip the road better but hurt mileage. There are compromises in tire design that you have to choose from.

If you have more power at a given rpm, you need to use less 'pedal' to keep that speed (rpm) or when you have to accelerate.

My GTA turns about 2000 rpm at 60 mph with 3.27 gears. I very seldom have to push more than a quarter or half inch to pass other vehicles. However, I can't resist punching it some.

2000 rpm on a TPI car is right in the heart of its torque range. The downside is it runs out of breath at about 4500-5000 rpm.

I spend way more time at 2000 rpm than 4500 rpm (it will do it but at 4500-5000 rpm I'm near 150 mph-which it will do, by the way) so if the engine is at or near its torque peak and you're not 'gunning' it all the time, you should get decent highway mileage.

City driving really kills the mpg for all the obvious reasons-idling wastes fuel and gets you nowhere.

I've read of tests by the manufacturers that found you get better mileage at 55 mph with your air conditioner on and windows closed than if you have them rolled down and the air off. It concerns aerodynamics. The air conditioner eats about 5-7 horsepower but the open window causes quite a bit of drag, which eats up more than that 5-7 horsepower.

As stated in my earlier post, most of the TPI cars were factory highway rated in the 24, 25, 26 mpg range. There are many guys (and gals) that get above 22-24 mpg on the TPIs (and other set-ups) that are totally stock.

Good power and good mileage are not mutually exclusive.

However (and I'm guilty of this at times, also) good power and good sense sometimes are.

Nothing sounds as good as a V-8 in full power mode.

We're not yanking your chain. Above 25 mpg is pretty easy on a well maintained TPI car and 30 is not out of the question.
jms