I get 11 mpg and I want to get better. How can get better mpg? I have a 305 with a 4bbl.

 

What
kind of transmission do you have?If you have a 700r4,it sounds like it's not locking up in 4th to give you overdrive.Your car ever had fuel injection originaly?You will need a lockup kit,or check out thetech articles on converter lockup.If not then check your plugs to see if they are fouled.you might be running to rich,and that may require changing your jets on the 4bb carb.In other words you might need a tune up.

 

Is it basically stock? If it is you would benifit from getting rid of that quadrajunk and getting a nice spreadbore with an HEI. I junked mine and my mileage when up from 16 to 20+ on a 350. That is pretty terrible, sounds like you need an overhaul on something, maybe the carb or a tune up. What mechanical condition is the car in?

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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.

 

It runs great. It has 122,000 miles on it. I just had it tuned. I was thinking about getting a tbi. would that help the gas milage.

 

Hey a quadrajet works sweet if you know what you are doing. I had a stock 305 in my 84 Z28 and I rebuilt the carb myself and after some tuning it worked great. The car had 320,000KM on it and it got better milage than my 91 TPI. A lot of people give quadrajets a hard time but they usually are the ones that know nothing about them.

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91 Z28 Camaro
305 TPI
Flowmaster 3" exhaust
700R4 with 2000 Stall and shift kit 3.42 rearend
One sweet sounding system

 

On the 83Z (305 HO and 700R4) about 10 to 11 but it's turning so much rpm it's no wonder. On the 86 IROC (305 TPI and 700R4) about 20 to 21 in town. At 70 mph the 83Z is running near 3500 rpm while the 86 IROC is only running 2000. Yes the clutch locks up on the 83Z, or at least shortly after the thing goes into OD the rpm drops again by about 200.

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Z's r Best