I was wondering what gas mileage everyone got. Mine I swear used to get alot per galon, now I am lucky if I can get 150 miles per tank I have a 89 firebird formula (350). I am wondering also what could be cuaseing such ****ty gas mileage. Oh and another thing, Anyone know how big the gas tank in my car is?
thanks
Ryan

 

Oh that reminds Me, How large would the Tank Be O My 85 ?

I looked it up someplace as a 12g Tank, But today I filled it Up from about 1/16 of a tank and put In like 12.6 gallons...




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60 Ranchero - Project ( Money Hole )
85 Z28 LG4 - Daily Driver
**Mods**
MSD Superconductors
14" Open Element
KYB all around

 

My '82 T/A gets like 9-11 miles per gallon. Stock LG4, but I get on it a lot. I think that the tank is 16 gallons. Not 100% sure though.

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'82 Firebird, dead stock, 9 bolt disc rear, over 200,000 miles and still going strong, more to come...

 

91 z-28 L98 17mpg city if i'm easy on it. 5mpg if I race like once or twice. One time I filled it up and less than 100 miles it was near empty and my tank is 15 or 15.5 gallons!

 

i get about 114 mpg on my 91 Z, that's before all the engine work, when i get it back, i'm not even going to bother driving i'm just gonna hangout at the gas station, hehe. (note: i do not have a 700-r4 trans or overdrive i got a turbo350) I'd imagine i'd get better gas with OD and a 700-R4.

FYI: the 91 and 92's are 16 gallon tanks, i dunno about any other years though.

 

My 87 TA has a 15.5 gallon tank. when i fill it up (gauge on "E") , it takes about 10.5 gallons to fill. this is due to a 5 gallon reserve. Oh yeah, i get about 10-15 Mpg city with my LG4 and 2.73 rear end.

P.S. picking up a 350 4 bolt today (free), after we pull the tow truck that was trying to pull the car up over the hillside!!!!

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1987 Trans Am
"Tired, old 305"
4 barrel
700R4 + B&M stage 2 Transpack
Thinkin' 'bout a 355

[This message has been edited by TK87TA (edited December 12, 2000).]

 

My 87 TA has a 15.5 gallon tank. when i fill it up (gauge on "E") , it takes about 10.5 gallons to fill. this is due to a 5 gallon reserve.

P.S. picking up a 350 4 bolt today (free), after we pull the tow truck that was trying to pull the car up over the hillside!!!!

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1987 Trans Am
"Tired, old 305"
4 barrel
700R4 + B&M stage 2 Transpack
Thinkin' 'bout a 355

 

My L98 gets about 16 mpg in the city and 21 mpg on the hwy.

 

about 15 on the street 20-23 on the highway

 

I just started about two months ago to pay attention to My gas millege. When I started I was getting about 16MPG for about two fillups Then for the last month and a halfn im am getting about 14mpgs. This is 50 miles a day going to and from school on 45mph roads with a bunch of lights.

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1987 Iroc 350
GTS headlight/tail light covers
Camaro SS Wheels w/Sumitomo HTR ZII 275 rear, 255's in front
K&N filters
Adjustable Borla cat back
Large tube runners
ported plenum
Holley afpr
SLP 1 3/4" headders (not installed yet)
FUTURE GOAL:
To go really F'in fast!!!

Some pics of it at
http://albums.photopoint.com/j/Album...949&Auth=false

 

IM getting around 20-23 mpg with a combination of city/highway driving. Mostly highway though.

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Black 90 IROC, L98, A4, 323 gear. SuperRamed 406 in the works!

[This message has been edited by MikeH (edited December 12, 2000).]

 

with my L98 and 3.23 gears I get anywhere from 16 to 23 mpg and I consistantly get about 280 to 310 out of a tank of gas, and I'm pretty sure my 91 GTA holds about 15.5 gallons.

j.wolfe

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j.wolfe
________
91 GTA
ET: 15.3@89.2mph in OD taking it easy on 190,000 mile engine!

 

The best I have gotten is 26MPG on the highway, but normally I get 12-15 city depending on FOOT WEIGHT . That is with T-56 and 3.73's, you can't beat those T-56's

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88 Monte SS 355 TPI/LT-4 HOT CAM/AFR Hydra-rev/ T-56 6-Speed

 

so my 1989 firebird has a 15.5 galon tank?

 

As far as I know all the T/A's and Camaros came with the 15.5 gallon tanks. As for my mileage I get anywhere from 15-18 city and 25-28 highway. Those 2.77's out back aren't **** for racing but when on a trip the extra mileage is great.

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1989 IROCZ28, 5.7 liter TPI, 700R-4, 2.77 Rear, Gutted Air Boxes, Flowmaster 80 series muffler with dual 3 1/2" tips, Clarion 8575 Head, Infintiy Kappa 4x6 plates, Stock 6x9's, Alumapro 10" Aluminum Sub in sealed box, Orion 400 watt amp

 

I get anywhere from 210 to 230 miles per tank.

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission with 2.77:1 Rear End

Current Mods: Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip with 160* Thermostat, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET : 14.32 @ 97.7mph
(corrected for elevation)

Soon to come: LT4 HOT Cam, Air Flow Research 190cc Heads, 2800 RPM Stall Converter and SLP 3.70 Rear End Gears.

 

Damn, I only get about 10-12 in my 89 GTA. I know it has the L98 but come on! Thats a little ridiculous, dont ya think? I dont even get 150 miles to a tank and thats driving very easy. Oh well, its still fun to drive.

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1989 GTA, L98/auto, t-tops, Black w/ grey int.
Ran a 14.85 @ 93.4 mph BONE STOCK

 

something is FUBARed then. Like your gas gauge is playing tricks on ya. Either that or your running extremely rich.

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j.wolfe
________
91 GTA
ET: 15.3@89.2mph in OD taking it easy on 190,000 mile engine!

 

I get about 300-330 per tank---I never even came close to that with the stock 305, I couldent beileive the difference when I put the new 350 in, and yes I do drive 80 %
highway---:-)

------------------
(Kill the headlights, and put it in neutral)

--George
92 RS 25th Aniv.
350 Goodwrench (NEW LO5)
700R4 Raptor: high performance intermediate billet servo, high performance overdrive billet servo,Mega Valve,13 vane high performance pump,1800 heavy-duty stall converter and a 29 element heavy-duty forward input sprag.

 

'91 Z28 with 5-speed and 3.08 rear, 95K miles.

My mileage comes closest to IROC350TPI. I thought my mileage was poor until I read what everyone else was getting.

With over 95% highway driving, I repeatedly get 28-29 mpg easy. With about 50/50 highway/city, I get 19-24, depending upon how much city driving I do.

Best mileage was on a trip to the west coast with about 1000 lbs. of cargo. I had a strong tailwind and calculated ~31.4 mpg. That was in 1997 with 33K miles.

Obviously I do not race - or at least if I did, I wouldn't be a serious threat...

 

Oh about 8mpg. 9 gallons will get me about 75miles.

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1986 Iroc Tpi, Mods?? sure.

 

so what is your secret? what can we do to get 24mpg, I get about 9 right now and it is killing me, when I first had my car I got about 300 per tank, now I can only get about 150-200, what could of gone wrong to cause that ****ty of gas mileage?
thanks
Ryan

 

if the T/As and camaros have 15.5 gallon tanks with these supposed 5 gallons of them not gauged for a reserve. then how come when I go around corners when I am close to empty the fuel pump starves like the tank is close to empty? has anyone really driven that far into empty on their gauge and gotten another FIVE Gallons out??!!!

 

the gas is in there,doesn't neccesarilly mean the pick-up will get it though.

 

87 TA LB9 - 16 city, 28 highway

I can't complain

 

i used to get around 200 miles to the tank with my old lg4, but with the new 350 i get about 250 and its faster too

daniel

 

I get 30 with straight highway at over 70 mph. The faster the better. Since I average 19-23 combined, I imagine all city would be 15-17 or so. The overdrive and 2.73's are great for long trips. When I first got mine, I only got 150/tank and it was leaking injectors at fault. I replaced them and that did the trick. It's a 15.5 gallon tank.

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89 Iroc-Z LB9 305 TPI auto 2.73 posi:
3" Dynomax "cat" back,K&N filters, TB bypass, 3" pipe in place of cat, cleaned and flow-matched injectors, 170' thermo, mild ignition mods, synthetic oil, kicker sound system, soon to have 3.73 posi...

 

I average about 110 miles to 10 gallons of gas, drivin around the streets all week. The most ive ever gotten out of a tank of gas was 185 miles, and this was about 70% highway driving.

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88 Iroc 305 TPI 5 speed
Performance Resource Chip, Flowmaster American Thunder cat back exhaust, B&M Ripper shifter, MSD coil, TB bypass, TPIS MAT relocation kit , TPIS 170* t-stat, Richmond 3.73 gears, March Power & Amp pullies Home made Ram Air
Best et: 14.338
Best mph: 96.97
Best 60': 2.106

http://hometown.aol.com/famioso15/johnnyiroc.html

 

i get anywhere from 130 - 170 mptank. depending on how many ricers rev there engine at me. i have a 305 too. it has an exhaust leak though....this leak causes the o2 sensor to read lean causing the computer to overcompensate and run it rich....so thats why...but on the highway..i get close to 400 miles per tank.

 

I'm Averaging anout 15 mpg on my L98. Seemed to be around 5 MPG for a while, but I think my MAF going had a lot to do with that.

 

I get about 25 or so more miles per tank on my tricked out L98 with the auto and the 2.77s than I did on my stock LG4 with the 5 speed and the 3.42s. So I guess that gearing doesn't do me so much harm after all.

------------------
1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission with 2.77:1 Rear End

Current Mods: Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip with 160* Thermostat, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET : 14.32 @ 97.7mph
(corrected for elevation)

Soon to come: LT4 HOT Cam, Air Flow Research 190cc Heads, 2800 RPM Stall Converter and SLP 3.70 Rear End Gears.

 

I am getting right at 15 mpg, which is down from about the 18 I was getting a few months back. I don't know if my foot got heavier or the ol LB9 is finally about to kick the bucket.

------------------
TPI 305,
Gutted airboxes,
gutted MAF,
K&N filters,
Corvette Servo.
14.9@93mph

"Speed kills, wanna live forever, drive a Ford."

 

you guys have to be kidding my formula gets 27 mpg and it has 24# inj at 50psi with 3.23s and a t-5 but, the auto was very close to the same.