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Old 02-03-2010, 09:52 PM   #27 (permalink)
Big Dave
Master EcoModder
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Join Date: Jan 2008
Location: Steppes of Central Indiana
Posts: 1,319

The Red Baron - '00 Ford F-350 XLT
90 day: 27.99 mpg (US)

Impala Phase Zero - '96 Chevrolet Impala SS
90 day: 21.03 mpg (US)
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Unless you raid the axle off an older Cadillac Fleetwood, even 3.08s are hard to find. The aftermarket no longer supplies the 3.08 set I have.

Bigger diameter tires will hurt you mileage. Stick with the OEM size tires. Sizing tires is one thing the OEMs do well.

I have talked to hundreds of truck guys and the story is always the same.

Bigger diameter = lower MPG.
2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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