Biodiesel blends of 20 percent and below will work in any diesel engine without the need for modifications. These blends will operate in diesel engines just like petroleum diesel. If the blend has been properly treated by the petroleum company, it will work year-round, even in cold climates. B20 also provides similar horsepower, torque, and mileage as diesel.
Ethanol is blended with gasoline in various amounts for use in vehicles.
10 percent ethanol, classified as “substantially similar” to gasoline by the U.S. Environmental Protection Agency and legal for use in any gasoline-powered vehicle. E10 is sold in every state. In fact, more than 95 percent of U.S. gasoline contains up to 10 percent ethanol to boost octane, meet air quality requirements or satisfy the Renewable Fuel Standard.
Up to 15 percent ethanol. EPA-approved in 2011 for use in model year 2001 and newer conventional vehicles. E15 delivers higher octane at a lower price and results in lower evaporative emissions.
Higher percentage blends of ethanol offer the best and least expensive way to increase octane for higher performance engines. In addition, higher blends result in lower sulfur content. For example, E30 cuts the amount of sulfur in gasoline by two-thirds.
E85 (also known as flex-fuel) is a high-level ethanol-gasoline blend containing 51 percent to 83 percent ethanol, depending on geography and season. It can be used in designated flexible fuel vehicles only. About one quarter of vehicles produced in 2015 will be flex-fuel capable.