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Gas mileage 305 L03 TBI?

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Old 08-26-2005, 02:13 PM
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Car: 1988 GTA
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Gas mileage 305 L03 TBI?

Hey what kind of gas mileage are you guys getting with your L03, TBI's. The one I am looking at is in a 90 Formula 5 spd.
Old 08-26-2005, 04:58 PM
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Car: 1991 Chevy Camaro
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 3.42
There's a recent thread on the TPI board where a lot of TBI guys posted what MPG they get. Check it out:
https://www.thirdgen.org/techbb2/sho...hreadid=314756

I've seen and heard of many 305 TBIs getting 30+ MPG with mostly highway driving. As far as city driving, it really varies (not sure why). I've seen anywhere from 10 to 20 MPG reports.


I personally get around 15 MPG with all city driving (nothing over 45 MPH). But, I do have some light mods and 3.42 gears, which don't really help in that area.
Old 08-26-2005, 06:04 PM
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Car: 1988 formula
Engine: 93' LT1 Swap in progress..
Transmission: 700r4
Axle/Gears: 2.73
i get 16 mpg around town and 25 highway with 2.73 in the rear
Old 08-28-2005, 03:33 AM
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Car: Camaro RS/SS
Engine: 5.7 LS1
Transmission: 4L60E Transgo shift kit, 3500 stall
Axle/Gears: 4th Gen Rear 3:42
I dont have a 5 speed but my Lo3 gave me about 32MPG going to L.A. but in city driving around 17-20mpg and i have a led foot.
Old 08-28-2005, 06:18 PM
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Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
When my LO3 was stock (T5) I would get 31mpg on all highway trips.
Old 08-28-2005, 07:28 PM
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
22-24 on the highway with a 245 RWHP L03 in a G20 w/ a 700r4 and a 3.08 gear.
Old 08-29-2005, 09:34 AM
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Thanks BenM that other thread covered it completly. It should get slightly better mileage than my 350 TPI did but on average they seem fairly close with a few exceptions of soem good highway mileage soem are reporting.
Old 08-29-2005, 04:49 PM
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Car: 1992 Z28 (Heritage Edition)
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 2.73 Posi
so OMCrider are you gonna get that formula??
Old 08-30-2005, 10:08 AM
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Car: 1988 GTA
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I am trying to bring him down on price, he's currently asking $2900. I am biding my time hopefully it won't sell and I can get him close to $2000 which is about what I am willing to pay for that particular car and feel I got a good deal.
Old 09-04-2005, 06:14 PM
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Car: 1991 Camaro RS
Engine: 305 TBI
Transmission: 700 R4
Axle/Gears: 273 rear end
i get 18.5 MPG in city and 22 on highway
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