Gas milage vs rear end ratio

[threecarb65@xxxxxxx]

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My personal experience went like this... I replaced the std 7 1/4 2.94? in a /6 Duster with a 3.23 8 3/4 and GAINED mpg! The Duster had a mild Crane cam and shaved head with porting.My theory is that the rpm increase at road speed put the engine in the "sweet spot"Granted, this was a low HP engine,but it was more fun to drive,and got more mpg.This may not hold true with an engine that already has a good power to weight ratio,the experts will know.Remember all the gadgets and trinkets in the old J.C. Whitney catalogs??? If you installed all of them and added up the % gains, your car would actually PRODUCE gasoline by saving more than it used! It is a fine line to find the ratio that will work the best for mpg,keeping the engine at it's "sweet spot" Too high of ratio will require more throttle to keep enough torque to maintain the desired speed,thus,more fuel consumption.Long flat road hill in the distance?Slowly get your speed up,ease up on the throttle as you start to lose speed. Stan "El Cheapo" Clinton

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