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Old 02-05-2012, 10:05 AM   #5 (permalink)
Big Dave
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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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I hear that a lot from guys with pickups, albeit at a much lower MPG level.

My answer: you're overgeared.

The closer to "properly geared" (for max MPG) the more sensitive the vehicle is to how it is driven. You're probably leaving a lot of MPG on the table, geared as you are.
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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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