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Ethanol has less energy in it which would hurt MPG's normally, but maybe with old carboreted gas engine it makes it run leaner. What your Oil consumption? As a comparison with my FORD CMAX Hybrid I have 4 cross-country gas tanks getting 64 to 68mpg. Also I had a 2007 FORD FOCUS with just adding Steeda air filter Kit and slightly larger Goodyear Fuel Max tires I got my MPG's up to 45mpg on the HWY. 57mpg is impreesive for a 40year old carboreted car.
Paul
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