Unleaded 88, also known as E15, is a gasoline blend that contains 15% ethanol and 85% gasoline. It is approved for use in all gasoline-powered vehicles model year 2001 and newer
. Unleaded 88 is often referred to as E15 because of its 15% ethanol concentration
. The higher octane level of Unleaded 88 helps boost horsepower and efficiency, and it burns cleaner and slower than regular unleaded gasoline, which has an octane rating of 87
. The ethanol in Unleaded 88 reduces lifecycle carbon emissions and tailpipe pollution, and it is a renewable biofuel that decreases greenhouse gas emissions
. Unleaded 88 can be used in nearly all existing fuel infrastructure without risk of damage
. Auto manufacturers approve the use of Unleaded 88, and according to an RFA analysis, more than 93% of model year 2019 vehicles have been explicitly approved for the use of Unleaded 88
. However, E15 should not be used in motorcycles, heavy-duty trucks, or non- traditional vehicles like snowmobiles or lawn mowers
. Unleaded 88 may get slightly lower gas mileage than regular unleaded gasoline, but the differences are minor and unlikely to be noticeable in the short term
. Experts say it is worth using if the price is low enough
