1997 Toyota Avalon Owners Manual - Page 138

If your engine knocks...If you detact heavy knocking even when using the recommended fuel, or if you hear steady knocking while holding a steady speed on level roads, consult your Toyota dealer. However, now and then, you may notice light knocking for a short time while accelerating or driving up hills. This is no cause for concern. GASOLINES CONTAINING DETERGENT ADDITIVES Toyota recommens use of gasolines that contain detergent additives to avoid build-up of engine deposits. For further details, ask your Toyota dealer or a local gasoline retailer.. GASOLINES CONTAINING MTBE Gasolines that contain MTBE (Methyl Tertiary-Butyl Ether) are available in the market. If you use a gasoline mixed with MTBE, make certain that it does not contain more than 15% of MTBE. If the use of gasolines containing MTBE causes poor driveability and/or poor fuel economy, you should discontinue the use of fuels containing MTBE. 130 GASOLINES CONTAINING ALCOHOL If you use gasohol in your Toyota, be sure that it is unleaded, has an octane rating no lower than 87 and does not contain more than 10% ethonol. Gasohol is a mixture of gasoline and ethanol. Toyota does not recommend the use of gasolines containing methonol. If you use gasoline containing methonol, use only gasoline meeting the requirements above and also containing less than 5% methanol with cosolvents and corrosion inhibitors for methanol. NOTICE zDo not use gasohol other than stated above. It will cause fuel system damage or vehicle performance problems. zIf driveablity problems are encountered (poor hot starting, vaporizing, engine knock, etc.), discontinue the use. zTake care not to spill gasohol during refueling. Gashol may cause paint damage. FUEL TANK CAPACITY 70 L (18.5 gal., 15.4 Imp. gal)