Am I the only one that runs sub 15 sec (14.92) in the quarter and gets 26mpg on medium grade gas. I know my car is well tuned and just put new exhaust and open element, but is that common? I know with my old GTA 350, I used to brag about getting over 10 mpg.

------------------
1989 Camaro Convertible RS
dark silver w/black top
305tbi, auto, 2.73 posi
SLP exhaust, 16x8 black GTA rims as soon as I get them
Check out Phil's Rice Boy Page

 

I'm getting 24's on the freeway and 19-20 around town if I can keep my foot out of it.

 

i get about 22-24 on the highway. would be better but my converter lock up is messed up and never locks.
before i modded my car i got 32mpg on a trip to upstate ny adn back.

lata
tim

------------------
91 Camaro RS-LO3,Auto.
14.209@95.46mph
Best 60' 1.917
Check Out The East Coast F-Body Nationals Home Page
www.geocities.com/njspeeder

My MAFB.ORG Home Page
www.mycar.net/mafb/registry/detail.cfm?id=299

DSI Racing Home Page
www.geocities.com/foff667

 

how many miles to the tank do you all get?

------------------
-Tas
'89 Formula WS-6
[soon to have Hooker 1-5/8" 50 state legal headers installed]

305, TBI, auto, 14x3 chrome flat based open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips....

Super GRK_Taz World
EFI & Intake Options
AOL IM: superGRtaz

 

Thats not something top brag about. I get 34 mog on the freeway on flat grades.
20+ on the surface streets. Maybe a little less now with the new cam.

But it was possible to get near 400 miles to a tank.


------------------
Trevor Myhre
91 Firebird Formula-
Built 355 w/ ATI ProCharger P600B 12psi, 2 core intercooler.
Pro-Built Stage 3 700-R4 w/ Continental 2400 stall TC
C5 wheels and tires.

92 Firebird Convertible-
TBI 305 w/ L98 cam, MSD 6A, Open Element, Free mods
700-R4
WS6 wheels and tires.

Me, my car and I
"Speed kills but it makes me feel alive" - White Zombie
Crazy street-racing idiot member of the All-Powerful Nor-Cal crew.

 

I'm talking city driving not highway. I haven't driven on the highway with it yet.

As far as miles per tank, it is around 400 with my 15.5 gallon tank.
------------------
1989 Camaro Convertible RS
dark silver w/black top
305tbi, auto, 2.73 posi
SLP exhaust, 16x8 black GTA rims as soon as I get them
Check out Phil's Rice Boy Page
[This message has been edited by 89RagTopRS (edited March 30, 2001).]

 

wtf i get about 6-10mpg i put 15 dollars to fill my tank and the most ive gotten has been 100miles why is mine so low its only a 305

 

I got 22/23 mpg on the test drive back to school. That's with the 350 . Can anybody do better than that with a 350?
Tim, I'm doing as good as you but I think I might be faster . We'll have to see when I run this beast at National Trails strip.


------------------
, Jon (350 TBI!)
91 Red RS w/grey int, sq stereo (Alpine v12, kicker solo, MB quart premium etc)

• Holley 670 TB unit w/ 1/2" spacer/adapter
• Edelbrock RPM vortec intake
• 350ho 330hp vortec crate motor
• 8" harm. balancer
• Stewart stage 2 water pump w/160 thermo
• SLP tri-y headers to full 3"
• Rebuilt trans w/ SLP shift kit
• Centerline 16x8's all around
• 36/24 mm sway bars
• Full poly bushings, even motor mounts
• SLP LCA and panhard
• Alston SFCs
• Edelbrock 3 point STB
• Global west steering brace aka wonderbar
• Eibach pro kit springs
• Bilstien high perf. struts and shocks
• All this and I still have AC

My websiteAny questions?

[This message has been edited by JPrevost (edited March 30, 2001).]

 

Damn, I have to fill up every .75 weeks with driving in the city. I get crappy gas mileage.

 

400 miles to the tank???? something is fishy. I haven't broken 150 miles to the tank. I almost never drive far on the freeway. My Jeep used to get 320 miles. now it gets 260-280(bigger tires). It has a HUGE tank too.

 

you just wanna go around and dare me to lay the smack down on you in a head to head in front of everybody don't you
like we discussed, this will be settled on august 4th buddy. maybe we can even get ethan involved

lata
tim



------------------
91 Camaro RS-LO3,Auto.
14.209@95.46mph
Best 60' 1.917
Check Out The East Coast F-Body Nationals Home Page
www.geocities.com/njspeeder

My MAFB.ORG Home Page
www.mycar.net/mafb/registry/detail.cfm?id=299

DSI Racing Home Page
www.geocities.com/foff667

 

Ethan will wreck both of us real good. 327 running 13's flat and he should be doing better than that. He doesn't even have specific shift points and he's running with a 600cfm holley. He needs a 700cfm with the current setup, we tried 750 but it was too big.
It'll be the battle of the TBIs. Tim with the 305 and experience and Jon with the 350. I'm going to the track wednesday. I need to do an oil change tomorrow morning. I also need to find a local guy that'll let me use his tools/jack etc to get my front suspension finished. Also need to order the cowl hood in a few days.

------------------
, Jon (350 TBI!)
91 Red RS w/grey int, sq stereo (Alpine v12, kicker solo, MB quart premium etc)

• Holley 670 TB unit w/ 1/2" spacer/adapter
• Edelbrock RPM vortec intake
• 350ho 330hp vortec crate motor
• 8" harm. balancer
• Stewart stage 2 water pump w/160 thermo
• SLP tri-y headers to full 3"
• Rebuilt trans w/ SLP shift kit
• Centerline 16x8's all around
• 36/24 mm sway bars
• Full poly bushings, even motor mounts
• SLP LCA and panhard
• Alston SFCs
• Edelbrock 3 point STB
• Global west steering brace aka wonderbar
• Eibach pro kit springs
• Bilstien high perf. struts and shocks
• All this and I still have AC

My websiteAny questions?

 

we got a 650 demon for my friends 327. I don't think its even mathmaticly possible to need more without a power adder.

------------------
-Tas
'89 Formula WS-6
[soon to have Hooker 1-5/8" 50 state legal headers installed]

305, TBI, auto, 14x3 chrome flat based open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips....

Super GRK_Taz World
EFI & Intake Options
AOL IM: superGRtaz

 

Back to the gas mileage, the best my car ever did was 32 MPG on a cross country trip, and I went about 450 miles on one tankful several times and that was at 75 MPH with the air condition on. I average 19 to 21 MPG most of the time and that's driving it hard. The worst it ever did was about 14 MPG but that was caused by a bad O2 senser.

------------------
92 Camaro RS 5.0 5-Speed
14" Open Air Cleaner
3.08 Posi-trac
Edelbrock TBI Intake
Crane cam
Ported & polished stock heads 3 angle valve job
HyperTech Chip
SLP Headers (Ceramic Coated)
UltraFlo cat-back exhaust

74 Dodge Dart Sport 360 (11.2 1/4 mile)

2000 Dodge 1500 Ram Sport

 

i go 220 consistantly for the past 3 yeasers driving agressivly in the city and short freeway trips. omaha has a sweet intersate system.

hiway trip. i went 370 miles across nebraska once.

400 gallon, your engine is going to meltdown from running so lean. either that or you have magic gas. sorry, im not buying it, but then again, i dont really care.

 

My car actually runs rich, it barely passed emmisions in PA. It was at its legal limit on Hc 1247ppm or something like that. Before I started letting it inhale and exhale a lot easier, I got around 340 miles on a tank.

The car is my baby and I don't drive it aggressively.

 

Shoot my 91 chevy p/u 350 gets about 10 miles to a gallon and about 275 miles to a 24 gallon tank.

 

Tas, in another post somewhere I was talking about going NO2 with him. He has a forged bottom end and a 700cfm double pumper would be great with a 100-200hp shot. I'm also going to try and get a 125 shot, I need to be carefull with the cast pistons though.

------------------
, Jon (350 TBI!)
91 Red RS w/grey int, sq stereo (Alpine v12, kicker solo, MB quart premium etc)

• Holley 670 TB unit w/ 1/2" spacer/adapter
• Edelbrock RPM vortec intake
• 350ho 330hp vortec crate motor
• 8" harm. balancer
• Stewart stage 2 water pump w/160 thermo
• SLP tri-y headers to full 3"
• Rebuilt trans w/ SLP shift kit
• Centerline 16x8's all around
• 36/24 mm sway bars
• Full poly bushings, even motor mounts
• SLP LCA and panhard
• Alston SFCs
• Edelbrock 3 point STB
• Global west steering brace aka wonderbar
• Eibach pro kit springs
• Bilstien high perf. struts and shocks
• All this and I still have AC

My websiteAny questions?

 

ya thats why I mentioned "unless you have a power adder" stuff. My friend most likely won't. He got the Edelbrock Victor Jr heads which should do fine on thier own IF HE EVER GETS IT GOING!!!! AHHH! lol he ended up getting a deal on a new car before we finished

 

Driving around the city my car drinks it up, but when taking long cruises on the highway I get great mileage. I had to take a class an hour a way from my house last summer and it was all highway. I don't remember how many miles I got per tank but when I would do the math it ended up being 30-31 mpg! This is no joke. but as soon as I run it I can watch the gague go down I once burned a quarter tank of gas in 15 mintues.



------------------
1990 RS 305 TBI T-5
.5" turbocity spacer
Summit 14X3 OpenElement W/k&N
Custom Exhaust
MSD - Wires, Cap, Rotor, Coil
Bosch Platinum +4 plugs
Metallic Red w/26,000 miles

 

i get MAYBE 200 miles to a tank.. bout 17 mpg city driving.

------------------
89 RS 305 TBI
Edelbrock 14x3 OE intake, Hypertech Chip, Street & Strip shift kit, flowmaster exhaust w/ high flow catco cat.
Soon: 3.73 gears, posi, Edelbrock TES headers(jet-hot) and a 355 SB
AIM:TiMoThY9801
Stereo:

JVC Detachable face cd player w/ 2 Pioneer 12" subs in custom box, powered by Lanzar 600 watt amp.
RIP #3 YOU RULED!

 

i have same car how come most ive eva gotten has been 98miles to my tank wtf its got 80,000 miles i mean my driving is mostly on side streets with a lot of stop signs but still

 

Lead foot and bad o2 sensor maybe.

------------------
, Jon (350 TBI!)
91 Red RS w/grey int, sq stereo (Alpine v12, kicker solo, MB quart premium etc)

• Holley 670 TB unit w/ 1/2" spacer/adapter
• Edelbrock RPM vortec intake
• 350ho 330hp vortec crate motor
• 8" harm. balancer
• Stewart stage 2 water pump w/160 thermo
• SLP tri-y headers to full 3"
• Rebuilt trans w/ SLP shift kit
• Centerline 16x8's all around
• 36/24 mm sway bars
• Full poly bushings, even motor mounts
• SLP LCA and panhard
• Alston SFCs
• Edelbrock 3 point STB
• Global west steering brace aka wonderbar
• Eibach pro kit springs
• Bilstien high perf. struts and shocks
• All this and I still have AC

My websiteAny questions?

 

snflupigus, so you don't believe anyone can get over 400 miles to a tank? I'm not the only one in here claiming to get over 30 MPG on the hwy. I've built my car to get good mileage and power, and I don't use magic gas, just plain old 87 octane. Just do some simple math 30 MPG X 15 gallons = 450 miles

------------------
92 Camaro RS 5.0 5-Speed
14" Open Air Cleaner
3.08 Posi-trac
Edelbrock TBI Intake
Crane cam
Ported & polished stock heads 3 angle valve job
HyperTech Chip
SLP Headers (Ceramic Coated)
UltraFlo cat-back exhaust

74 Dodge Dart Sport 360 (11.2 1/4 mile)

2000 Dodge 1500 Ram Sport

 

LoL, 400 miles per tank is REALLY good. Espically since these engies were 17mpg stock. I beilve with my 3:73's I got 18.5mpg but that was probably because of my ignition stuff and my headers and no cat.

BTW: I have a question for the Ragtop guy.
You run a 14.92 in the 1/4 mile with just an SLP cat-back? LoL. Am I missing something here?

------------------
Eric Natzke
91 Firebird 305 TBI
"It Ain't Stock"
http://members.aol.com/j007golden/91firebird.html
For info on certain parts or mods go to the site below
http://members.aol.com/j007golden/modeval.html

 

I get about 20 per gallon. My car needs a tune up bad, should be getting about 22 or 23 at least I would think. That's backroad driving.

My dad's 88 fullsize truck gets 17 backroad driving and used to get 22mpg on the highway. It has a 350TBI and 2.7? gears.

I have a friend with an '85 TA he gets 26 with a LG4(carb). That's pure highway driving though.


------------------
1989 Pontiac Firebird Formula LO3 Auto
-180 degree stat
-Hooker Cat-Back
-vinyl security shade, velcro t-top bag
*****Possible summer '01 mods*****
Dual Snorkle, Auburn Posi, Keyless Entry, Wonder Bar from my IROC, 4th gen seats, T/A tail lights

http://www.geocities.com/krt80/

 

Eric,
The SLP and Open element are the new additions to the TBI. I was getting 23mpg city prior to those two mods.

I put on my friend's 80 shot of nitrous in my car (he had a TBI and he totalled it) for race days and it boosted it to that. I only use it for races and remove the bottle, chip etc when done. Note, I race 1-2 times a year max.

Even if I didn't remove it, it wouldn't affect my mpg as I don't run my car over 2000rpm when driving around town. The nitrous would never kick in. I just hate having the stuff sitting in my car not doing anything benefitial to street driving.

 

30 mpg = almost twice the stock mpg!

whats so hard to beleive about me not beleiving that.

its like saying (if i had one) my honda gets 70mpg on the highway, (stock rating = 35)

hmmm, cant you see where i would have trouble beleiving that. hehehe.

if you do, thats ausome. and 30mpg highway is great, i get almost that. but thats when i drive for 8hrs, at the exact same speed.

maybe he works the draft, i like to keep my distance back from the cars infront of me.

17x14.5 (you cant use all 15) = 246.5 that sounds about right for city. if i kept my foot out, and it was right after a tuneup.

25hwy,x14.5 = 352.5

those sound more reasonable.

 

o, and dart, what exactly was it that you did to your car to specifically improve its mileage. i guess that when i read your sig, your mods might have improved ve. so for you i guess i may be able to beleive. but a stock l03 getting 30mpg on the hwy, i have a hard time still

 

Hey snflupigus,
I don't get why you don't believe any of this. Its like me saying I don't think your car is faster than you say it to be because the factory numbers aren't the same as what you claim. The cars stock ran 16s generally and say it now it runs 8 seconds. I don't believe this b/c it is twice as fast as when it was built. There is my logic on the situation. I made the mpg with mods just like someone gets speed.

These cars have restrictive everything and there is a lot of power and gas mileage to pull from these cars. I got rid of almost all the restrictive parts in my car to free the mileage up and increase the acceleration a bit. I don't race much anymore and I wanted to go farther for my dollar, so that was what I went for...and I did it.

As with the Honda analogy, I doubt anyone could pull the 70mpg as technology has allowed it to be very efficient and economical already as well as pass emmisions with flying colors.

 

snflupigus, I'll try to clear up some things I said, when I said I have gone 450 miles on a tank that is true, but it was over flat ground out west on one of several cross country trips I have taken, and it was driving from point to point with no stops and the cruise control on, once I got 32 MPG but that was driving downhill from Denver Co.5000+ ft.elev. to Salina Kansas which if you look at the Rand Mcnally atlas it is 436 miles. Most of the time daily driving I get about 19 to 21 MPG avg. And as you said I have done several things to improve the VE. of my car. Everybody puts down the stock heads but they work pretty good if they are prepared correctly. I spent a lot of time polishing and port matching the heads to the intake, and an old racing friend showed me how to pocket port the area over the intake valve to get the most flow while maintaining the velocity of the incoming air flow. The same goes for the exhaust. I'm a machinist (not automotive) so I put them in a mill and did my own 3 angle valve job and used polished backcut valves with undercut stems. All that work paid off as my engine will now wind up freely to 5500 RPM, I could go on for a long time about other things I have done and not put in my signature, but I'll stop here.

------------------
92 Camaro RS 5.0 5-Speed
14" Open Air Cleaner
3.08 Posi-trac
Edelbrock TBI Intake
Crane cam
Ported & polished stock heads 3 angle valve job
HyperTech Chip
SLP Headers (Ceramic Coated)
UltraFlo cat-back exhaust

74 Dodge Dart Sport 360 (11.2 1/4 mile)

2000 Dodge 1500 Ram Sport

 

ya, downhill from the mountains makes a huge diff. ive driven that trip before too

i beleive you got that mpg, and your city average is very beleivable. thats about what i get if i dont hotrod it.

as for ragtop, stock that is amazing to me, i guess its not that i dont beleive it, it just suprises me. i wont discredit you. if you say thats what you get, i beleive you, its just amazing. a stock l03 getting 26mpg all the time. You must drive like a grandmother. o, and like i said above, i dont really care much. and our approach at thinking about it is slightly different.

ill leave it at that. btw, i wish i got 26mpg all day everyday like you. it must be nice.

enjoy it, i think it is uncommon.

 

Lets move this post out from between all those locked post.TTT

 

I have a 5 speed LO3 and I get 30 mpg on the highway as well. I don't run it hard and I don't down shift to get around people. My speed avg is anywhere from 75 to 85 between Indianapolis and Atlanta. I have Headers, flowmaster catback, and chip, but I because of the chip I am required to run 92 Octane gas. My wife's Camry only gets 33mpg on the same trip, but because it is a 4 cyl and auto, it has to downshift and rev way up to get up to speed sometimes. I think the combination of good low end torque, 3.08 gears, driving style, and my mods have a lot to do with the mileage. BTW, my car has 123,000 miles on it too.

Chris

 

my 91 convertible rs get 27mpg highway 152,000 miles on the clock. valve seals leak and burns a little oil on start up timing chain is makin a mess of noise- i really gotto get that fixed and i run on 87 octane gas. auto trans as well. that 27mpg was at 85mph through montana. sorry about digging up the old post just figured i would brag about my milage too. I never thought i would ever get milage like that, its better than my 95 civic si which is doing 21 mpg highway. - now thats somthing to think about. 4500 lb car vs. 2800 lb car. wonder what gm is doing now that there milage numbers are not as high as in our cars that are over 15 years old in some cases.