2008 Toyota Prius Owners Manual - Page 499

6-1. Specifications NOTICE n Notice on gasoline quality l Do not use leaded gasoline. Leaded gasoline can cause damage to your vehicle's three-way catalytic converters causing the emission control system to malfunction. l Do not use gasohol other than that stated here. Other gasohol may cause fuel system damage or vehicle performance problems. l Using unleaded gasoline with an octane number or rating lower than that stated here will cause persistent heavy knocking. At worst, this will lead to engine damage. n Fuel-related poor driveability If after using a different type of fuel, poor driveability is encountered (poor hot starting, vaporization, engine knocking, etc.), discontinue the use of that type of fuel. n When refueling with gasohole Take care not to spill gasohol. It can damage your vehicle's paint. 474 PRIUS_U_(L/O_0802)