Quote:
Originally Posted by ProDigit
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).
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That's a good point. But anyway, as I previously said, I'd never hold my breath for just a taller gearing to fare exactly the same way as cylinder deactivation, even though in most cases I'd not expect it to actually harm fuel-efficiency.