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Fuel additives are used to improve an automobile's environmental performance and increase its mileage. Some homemade fuel additives are ethanol and a mixture of acetone, xylene and cycle oil.

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Q: What homemade additive can you add to gasoline to get better mileage?
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Which gives better mileage unleaded gasoline or premium gasoline?

The best gas mileage from unleaded gasoline or premium gasoline depends on the car. Old cars get better mileage from unleaded.


Is gas mileage better with E85 or Regular gasoline?

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