Unleaded 88 is a type of gasoline that contains 15% ethanol and 85% gasoline. It is often referred to as E15 because of its 15% ethanol concentration. Unleaded 88 gets its name from its octane rating of 88. The U.S. Environmental Protection Agency approves of using Unleaded 88 in cars, trucks, and SUVs model year 2001 and newer. Auto manufacturers also approve the use of Unleaded 88, and more than 93% of model year 2019 vehicles have been explicitly approved for its use. Unleaded 88 is a cleaner-burning fuel option compared to traditional gasoline, and it can help reduce greenhouse gas emissions and dependence on fossil fuels. According to experts, unleaded 88 gets slightly lower gas mileage than regular unleaded, but the differences are minor. The energy density of Unleaded 88 and regular unleaded are very similar, and it’s unlikely you’ll notice any difference in fuel economy. Unleaded 88 is also not recommended for small engines, such as a lawn mower or for fueling boats.