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Do you think premium gas is free of ethanol and the best choice for small engines? Do you ever treat your car to an occasional tank of premium because you think it cleans fuel injectors better and provides more power? If you’ve ever been confused by which gas to use and why, this story is for you. We consulted gasoline expert Fred Walas of Marathon Petroleum Company, the fourth-largest refining company in the United States. He gave us the lowdown on regular vs. premium fuels, and answered all our burning questions about gasoline.