TBI 305 gas mileage

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Dec 5, 2004 | 09:15 PM

Duke901

Thread Starter

Senior Member

Joined: Jul 2001

Posts: 518

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From: SYLVANIA,OHIO,USA

Car: 89 Formula

TBI 305 gas mileage

I was wondering what kinda of gas mileage to expect with a 91 firebird with the l03 and 2:73 gear and 700r4.
Thank you
Mike

Dec 5, 2004 | 09:23 PM

70BuickSleeper

Member

Joined: Feb 2004

Posts: 100

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From: NJ

Car: 84 Z28

Engine: 305 HO

Transmission: 700r4

I would think somewhere near 30 highway. Im running 3.73s, and my carb might be a little rich, and I get around 20 on highway turning 2500-3000 for about 45 mins. In town mine is prolly around 10 because its hard to resist getting on the gas.

Dec 5, 2004 | 09:52 PM

firebirdpl

Member

Joined: May 2002

Posts: 398

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From: Long Island, NY

Car: 89 Formula

Engine: 305 TBI

Transmission: 700R4

with my 3.73 and some mods i have gotten 31 on the highway doin 70+

Dec 5, 2004 | 10:00 PM

70BuickSleeper

Member

Joined: Feb 2004

Posts: 100

Likes: 0

From: NJ

Car: 84 Z28

Engine: 305 HO

Transmission: 700r4

Yeah im in need of some tuning up. If hes got the 2.73s, he should be easy to 30 highway prolly 20 ish city with the tbi setup.

Dec 5, 2004 | 10:05 PM

90RS305

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Joined: Apr 2003

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From: Tempe, Arizona

Car: 96 Silverado/99 Suburban

Engine: 700 cubic inches of 'Muican Awesome

Transmission: 4L80/4L60

Axle/Gears: Chunky/Clunky

Please use there search button. I guarantee you this question has come up more than a few times... I know you'll find the info your looking for! HTH...

Bruce (90RS305)