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interesting idea, but RPM alone won't guide you to better fuel efficiency.
my torque peaks at 4000 RPM, which is where BSFC(fuel used per unit of power produced) is at it's best.
i could either stay in 2nd gear to run 60MPH and be at 4000RPM or be in 4th at slightly less than 1800RPM, it should be quite obvious which one will result in better fuel economy/less wear/etc.
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