Unleaded 88 is a type of gasoline that contains 15% ethanol and has an octane rating of 88. It is a blend of 85% gasoline and 15% ethanol, making it more environmentally friendly than the more common 87-octane gasoline. Sheetz, a convenience store chain, offers Unleaded 88 at a discounted price. It is approved by the U.S. Environmental Protection Agency for use in all 2001 and newer cars, trucks, and SUVs. However, it is important to check your owner's manual to verify the minimum octane required and ensure that your vehicle can handle 15% ethanol