Bad Gas Mileage???
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Junior Member
Joined: Mar 2001
Posts: 47
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From: corpus christi tx, usa
Car: 1989 formula 350
Engine: tpi 350
Transmission: th700r4
Bad Gas Mileage???
I have an 89 formula 350 firebird. When i got it, I would get around 120 miles before my
next fill up. Then when i cracked my valves we machined the heads and i got alittle more Then I put high flow cats, a flowmaster, filter chargerand accel plugs/wires/ &supercoil. I now have around 140-150 to the tank. But what is up with the bad gas mileage?? It seems like the more power I get the better the gas mileage gets but it just slowely grows.
next fill up. Then when i cracked my valves we machined the heads and i got alittle more Then I put high flow cats, a flowmaster, filter chargerand accel plugs/wires/ &supercoil. I now have around 140-150 to the tank. But what is up with the bad gas mileage?? It seems like the more power I get the better the gas mileage gets but it just slowely grows.
Supreme Member
Joined: Oct 2000
Posts: 2,264
Likes: 0
Well I just figured mine yesterday, 143 miles on 12.5 gallons.
thats a stock LG4, I wonder if something is amiss with my carb ?
nah,....!
thats stop and go, heavy footed driving too.
about as bad as I could make it.
------------------
60 Ranchero - Project ( Money Hole )
85 Sport Coupe LG4 - Daily Driver
Just another Hot Rod kid, or thats what they all tell me.
Livin' the Stereotype
thats a stock LG4, I wonder if something is amiss with my carb ?
nah,....!
thats stop and go, heavy footed driving too.
about as bad as I could make it.
------------------
60 Ranchero - Project ( Money Hole )
85 Sport Coupe LG4 - Daily Driver
Just another Hot Rod kid, or thats what they all tell me.
Livin' the Stereotype
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