Quote:
Originally Posted by cRiPpLe_rOoStEr
Dropping the RPM with a taller gearing while cruising sounds like a cost-effective approach. Not sure if the final results would be so similar to what the OP might be expecting, but still seems to be a safe bet.
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Roughly speaking for every 12% in gearing increase, you'll get a 10% of MPG increase.
It's not linear, meaning you'll get better MPGs at lower speeds, and MPGs at highway speeds will be closer to identical; to worse (when the engine load is too high, and the engine is pinging or knocking).