E is an abbreviation typically referring to an ethanol fuel blend of ethanol fuel and gasoline or other hydrocarbon by volume. In the United States, the .What is E? E can be used in all Flex Fuel Vehicles manufactured after for GM vehicles . It is a gasoline ethanol blend containing up to ethanol..Buy Stant Y E Flex Fuel Locking Gas Cap Fuel System Amazon.com FREE DELIVERY possible on eligible purchases.Flex Fuel with Mega. Controller Many Mega.ers have expressed an interest in having Mega control flexible fuel vehicles, typically E gasoline engines..Save on every tank fill up with EcoFuelBox E Ethanol Conversion Kit, Kit E, Kit Flex Fuel, Kit Bioethanol, Kit Etanol, Superethanol, Ethanol kit, Etanol..