1997 Mercury Mystique Owner Guide 1st Printing - Page 209

Fuel quality If you are experiencing starting, rough idle or hesitation problems try a different brand of fuel. If the condition persists, see your dealer or a qualified service technician. The American Automobile Manufacturers Association (AAMA) issued a gasoline specification to provide information on high quality fuels that optimize the performance of your vehicle. We recommend the use of gasolines that meet the AAMA specification if they are available. It should not be necessary to add any aftermarket products to your fuel tank if you continue to use a high-quality fuel. Cleaner Air Ford approves the use of gasolines to improve air quality, including reformulated gasolines that contain oxygenates such as a maximum of 10% ethanol or 15% MTBE. There should be no more than 5% methanol with cosolvents and additives to protect the fuel system. Reformulated fuel is also required in certain areas of the U.S. These fuels are designed to further reduce the emissions from your vehicle. Generally, you should not experience difficulties operating your vehicle on fuels containing oxygenates. We encourage you to use these fuels. 210