Acctual 350 Gas Mileage

[chevytrucks92]

Originally Posted by YBNRML

I recently purchased a 96 Z71 and it only gets about 10mpg in the city. It has the 3.73 rear end and the previous owner removed the converters.

I installed the 40series flowmasters ans it is loud really loud (nice). I was told that the removal of the converters is not only illegal but would also hurt the gas mileage and reduce my low end torque. I have a 00 5.3ltr that will leave it in the dust. Whats my problem????

If anything, removing the converter will give you more horsepower becuase it gives you a higher flowing exhaust. Now in the long run, it will get the valves in your engine, but you should have more hp without it.

As for the 2000 5.3 leaving you in the dust, well that's probably becuase it has a higher revving engine that makes 30 more hp (5.3 is based off the LS1).

[YBNRML]

Thanks for your input

[Fish36991]

1992 350 4x4 extended cab 5-speed getting 20-21 on the highway running 87 octane....just did it night before last from Nashville,TN to Raleigh, NC so that was even over some smaller mountains.

Josh

[KylePBZ]

96 CrewCab, short bed, 1500, 2wd. I've got redone factory duals with bullet style mufflers, AirRaid intake, Granatelli Mass Air, Tornado, keep it tuned, etc. I'm pretty sure it's got atleast 3.73 gears, it spins 3000rpms at 75 in OD. I get about 16 average, I usually get about 19 if it's all highway.

[PAC730]

1997 suburban, 5.7ltr, C 1500, 74,390 miles, I get 15mpg, mixed city and highway, I think that is just what these suburbs get.

[robertjr]

I get about 6 to 8mpg but I'm running a 350 with edelbrock performer heads, intake, 600cfm carb. and preformer plus cam. I have gibson headers runnin down to 2 1/2 true dual with 40 series flowmasters. turnin 38x13.50R15! But the kicker is when you get out and stand on it you can literally watch the fuel gauge drop!