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Neat idea! I've been tempted to do the same with the F-150.
Not sure why you are thinking you are getting a reduction in RPMs at speed since that would happen only if your torque converter (automatic tranny, right?) had been slipping or you were running larger tires.
Any mpg increases whould come from reduced throttle openings due to lower horsepower requirements at lower drag levels.
Keep up the good work!
Les
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Best
Les
My train of thought has been replaced by a bumper car.
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