Interesting: Seems it will not cause enough improvement to be even worth the trouble.
I believe I came up with the same answer last time.
My idea of a double overdrive still seems the best, but my research shows it will only work with a engine that has plenty of low RPM torque, other wise you end up lugging the engine.
That and a lean burn cruising setting which also is said to give 5+ MPG.
Rich
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