Buying E10 fuel (a mixture that contains 10 percent ethanol) from a hose that also supplies E15 fuel (a mixture that contains 15 percent ethanol) must buy at least four gallons to protect customers following behind. Ethanol is hard on engines and less efficient than regular gasoline. E15 can even cause engine failure in smaller or older engines. So if you’re using a blender pump to buy E10 that sells both E15 and E10, the residual amount of E15 left in the hose from the previous customer could cause significant damage to those smaller and older engines—unless you purchase at least 4 gallons.
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