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I plan on adding a second overdrive to the Explorer as road testing has shown that if I can drive it at 50MPG she can get around 30MPG, so adding a 6th gear by a second overdrive I might get that MPG at 1500 RPMs...and at 75MPH....but that is a rare thing to do and not practical for almost everyone.
I believe this will only work on cars where the engine makes good low RPM torque. It only will work on a few cars and SUVs.
Rich
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