I'm only getting about 200 miles per tank of gas...My car is a 91 z28 with a 305 TPI and auto. I also checked the fuel pressure and it is just where it needs to be. Any ideas???

------------------
White 91 Z-28:
Mods:
Comp Cam, ported plenum and runners, AFPR, air foil, and a few other goodies ...soon to have an LS1 and 6-speed!!!

[This message has been edited by amc91z (edited July 30, 2002).]

 

What did you get b4? Thats about the same as I get.

------------------
91 RS Camaro 5-speed black w/t-tops 305 TBI now TPI
MODS: SLP cold air intake w/K&N, air foil,Accel 19 LB injectors, March aluminum under drive pullies, Alburn pro posi, Aluminum drive shaft, Random Technology 3'' cat-back, 8.5mm MSD wires, 160 thermo, jet fan swich, Custom chip with 91 vette computer, SSBC slotted rotors, optima battery in the rear, BMR adjustable lower control arms and panhard rod, Kenny Brown strut tower brace, TB bypass, no egr, no air

 

I'm not sure what this car got before...as soon as I bought it I put the cam in it and the other goodies. My 89 IROC w/350 and auto got better gas mileage and it had alot more stuff done to it than this little 305.
Thanks,
Adam

------------------
White 91 Z-28:
Currntly a 305 TPI w/auto car.
Mods:
Comp Cam, ported plenum and runners, AFPR, air foil, 4.11 gears, and a few other goodies...soon to have an LS1 and 6-speed!!!

 

you get 200 miles out of 15 gallons or less of gas lets see, 14 mpg or a little more, yeah i know it seems low but remember these are sports type cars, with a v8 engine, they aren't intended to get great mileage, and keep in mind the more you beat it, the more gas you use, so mileage drops, it also depends on city or highway driving

although i do think you should be a little better than you are, since i average about 12-13mpg on the highway at around 80-85 mph, (yeah i speed, what of it?), its wierd though if i run closer to the speed limit like as in 65-70, i get worse mileage, figure that one out for me

------------------
84' Firebird, 305ci lg4, 700R4, 288/292 duration .450/.460 lift,Edelbrock Performer intake, Holley 600cfm 4 barrel, K&N filter, Pacesetter Headers, 3'single exhuast, dual out muffler, no cat,Motive 3.73's and Auburn Posi
1/4mile 15.17sec @ 92.5mph

currently in pieces, for manual swap

 

4.11 gears aren't going to net you the best gas mileage Also, what are the specs on the cam...if it is too much that could be a factor also...

------------------
1991 Camaro RS
www.sethirden.org

 

Are you talking highway or city??

 

i get that with my 383

 

It doesn't matter if I'm doing city driving or highway...it still gets just about the same. The cam is a comp cam w/210in 220ex duration, .500in .510ex lift, and 114 degree lobe sep.
Thanks,
Adam

------------------
White 91 Z-28:
Currntly a 305 TPI w/auto car.
Mods:
Comp Cam, ported plenum and runners, AFPR, air foil, 4.11 gears, and a few other goodies...soon to have an LS1 and 6-speed!!!

 

hmm I get 18 mpg city driving. About 23-25 on the highway depending on speed. You should be gettin better, how many miles u got on that beast?

------------------
1983 Z-28
305 LU5 V8(Cross-fire Injection)
Radical Cam
Limited Slip Differential w/
3.23 Gears
700R4
T-Tops
Pics-- http://www14.brinkster.com/ctrwsz28/

 

She's got 137,xxx miles and still runs good for a little 305 ...

------------------
White 91 Z-28:
Currntly a 305 TPI w/auto car.
Mods:
Comp Cam, ported plenum and runners, AFPR, air foil, 4.11 gears, and a few other goodies...soon to have an LS1 and 6-speed!!!

 

Are you running a custom chip?

Please Please Please don't say you rae running the stock chip.

------------------
I WOULD RATHER PUSH A CAMARO THAN DRIVE AN IMPORT

1983Z28
Superramed roller 406 10.5 compression, AFR 195's and custom cam.

future mods:
N20 waiting to be installed

Wifes new car:

1995 Z28
AT, leather, T-tops bone stock for now. 250 RWHP 300 RWT 14.0 @ 99 MPH on a 2.2 60'

future mods:
header to tailpipe replacement and a cold air intake. Then I am just going to leave it alone (maybe)

 

doesn't sound too bad...if i hop on the gas fairly often, I'll get about 200 miles to the 11-12 gallons i use before gassing up. If I drive conservatively, I'll get a good 240 miles out of the same amount of gas. This is in-town driving. Interstate driving, I'll get about 24 mpg.

------------------
91 305 drop top
Holley air cleaner
Flowmaster 80 Series
Bosch Platinum 4+ plugs
160* thermo
B&M shift kit (waiting to get put in)
Cragar S/S wheels-just so I could negate any speed I may have gained
more coming soon

 

86 TA 305 4bbl stock except for straight pipes. 180-210 miles per tank

 

I guess I'm not doing too bad as far as gas mileage if everyone else is getting about the same...Thanks for all the help...Adam

------------------
White 91 Z-28:
Currntly a 305 TPI w/auto car.
Mods:
Comp Cam, ported plenum and runners, AFPR, air foil, 4.11 gears, and a few other goodies...soon to have an LS1 and 6-speed!!!

 

I fill up every 200 or so miles, but hit empty around 250 give or take a few for how many times I stomp it. I really wish the gas mileage was better, but not much I can do about it.

------------------
1990 IROC-Z 5.7l
1/8: 9.06 at 76.39 mph with a 2.02 '60
- dual exhaust, underdrive pulley, 160 stat