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On pickups, bigger diameter wheels/tires ALWAYS result in LOWER MPG.
To repeat big tires = lower MPG.
Reason: Rotational inertia. When you accelerate away from a stop, you must not only translationally accelerate the vehicle but also those four "flywheels" attached to it. The rotational moment of inertia goes up with the square of the outside diameter. On a pickup, going from 235-85x16 to 305-75x16 tires costs the owner 2 MPG.
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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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