Cars, trucks, and farm machinery can all run on low-volume biofuel blends without any alteration. Current car warranties cover operation with ethanol-blended gas of up to ten percent (E10). Flexible Fuel Vehicles (FFVs) operate on any combination of ethanol and gasoline. FFVs are being sold in the U.S., Brazil, and China. As ethanol has a higher octane, it is used as a gasoline additive to improve vehicle performance. In fact, many international racing teams use ethanol because of its high performance qualities. Biodiesel blends of 20% (B20) show similar operation in conventional diesel engines as regular diesel fuel.