View Poll Results: What kind of gas mileage do you get out of your 350 engine
7-9
4
21.05%
10-12
4
21.05%
13-15
1
5.26%
16+
10
52.63%
Voters: 19. You may not vote on this poll
For all you 350 owner how man mpg do you get
Joined: Mar 2000
Posts: 43,187
Likes: 43
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
About 11-12 mpg. Mods include Edelbrock 1903 q-jet, high-flow 2-1/2" cat, synthetic lubes, 4.56 gears, 2" reciever hitch.
Oh, did I mention the horse trailer? This is the van that pulls it.
That's the only 350 I have right now. But, you didn't say anything about what kind of vehicle it had to be in...
Oh, did I mention the horse trailer? This is the van that pulls it.
That's the only 350 I have right now. But, you didn't say anything about what kind of vehicle it had to be in...
Supreme Member
Joined: Feb 2002
Posts: 2,663
Likes: 9
From: Buckhannon, WV
Car: 84' Monte
Engine: 350
Transmission: 700-r4
Axle/Gears: ferd 9" posi 3.50 gears
I have a monte carlo but they supposedly weigh about the same as a 3rd gen. I get 21 on the highway and average about 18 with about half city driving. This is a 750 carter carb too which is way too big.
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Senior Member
Joined: Nov 2000
Posts: 798
Likes: 0
From: Richmond, VA
23 mpg on Highway with the heaviest "black" spring for the secondaries. No Idea about the city, I like to drive with the lighter "plain" spring around town so the secondaries open quicker.
Mods are Holley 600 CFM carb, Performer RPM intake, Edelbrock TES Exhaust.
Mods are Holley 600 CFM carb, Performer RPM intake, Edelbrock TES Exhaust.
Last edited by 84TransAm; Apr 3, 2002 at 08:13 PM.
Senior Member
Joined: Mar 2002
Posts: 586
Likes: 0
From: fairborn, ohio
i got a 350 block...does that count???? and i get less that 10mpg. mods in the sig......oh but it will get worse as i don't have my 9" in yet.....still got the stock 3.73 rear end which i put a mini spool in.
and i get less that 10mpg. mods in the sig......oh but it will get worse as i don't have my 9" in yet.....still got the stock 3.73 rear end which i put a mini spool in. 
Supreme Member
Joined: Jan 2001
Posts: 1,411
Likes: 3
From: Rock Hill, SC
Car: 1999 Pontiac T/A Firehawk
Engine: ***'s Engine
Transmission: T56
Stock ZZ4 crate motor, manifolds, dual cats, flowmaster cat back, stock EQjet, DR rods, TBI WC T5, 3.23 posi 10-bolt, rich exhaust code in the ECM.
19 city 21 highway.
19 city 21 highway.
Senior Member
Joined: Jul 2000
Posts: 992
Likes: 0
From: Tx
Car: 92 Z, 91 Formula, 04 CTS, 01 Tahoe
Engine: 355 forged 4 bolt, SuperRam, 58mm t
Transmission: T5, looking for t-56
I've been averaging mine the past two weeks,and I've come up with around 9-12mpg.
355,9.75:1 CR,worked-over GM heads,292 duration .501"lift cam,Power Plus hi rise alum intake,Holley 750 DP,Hooker SC longtubes,true 3" duals,3.27 gears,and 700r4 W/2500 stall.
355,9.75:1 CR,worked-over GM heads,292 duration .501"lift cam,Power Plus hi rise alum intake,Holley 750 DP,Hooker SC longtubes,true 3" duals,3.27 gears,and 700r4 W/2500 stall.
Last edited by RSpeed; Apr 6, 2002 at 05:02 AM.
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