Thread: O/D on or off??
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Old 12-02-2010, 03:35 PM
nanney1 nanney1 is offline
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Maybe simple, maybe not. A couple of different things going on here.

From what I've read here, lugging the truck at low rpms with O/D on may cause lower fuel mileage than running higher rpms with O/D off at the same speed. I guess the idea of the engine being in a better power band results in better mileage for lower speeds. Seems counterintuitive, but that's what I'm reading here.

The other point that was made was that running with O/D off at lower speeds is better for the life of the tranny. Different issue than mileage.

Last edited by nanney1; 12-03-2010 at 08:04 AM.
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