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heres my take if youre getting 3.65 miles per gal then something is wrong with the math youre using or something is wrong with your right foot. running 38s and a 350 i was able to get 8-10 out of my 79 with a sm465 (3 speed trans) even if you put a LS motor with those low numbers you might be able to get 6. when in reality you should be getting 11-15. but dont be so hard on the gas pedal and keep the speed 60 and below.