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Originally Posted by 6567GTO
Well, my car isn't exactly an economy car (520+ HP) but it sure helps when going to cruises and shows which require taking the highway. At 70-75 mph my car is revving around 2300 rpm +/- 100 r's with my 3.73's vs before with my 4 speed it revved around 3500+ rpm.
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hey even big engines can get good mileage, your carburated and high hp so i mean i dont expect like 18 or anything but just wondered if it would beat my 400ci 2spd 2.78:1 gear 11mpg by atleast 2-3 mpg. anything helps at the pump and going the distance....