1993 Pontiac Firebird Owner's Manual - Page 220

Methanol is methyl or wood alcohol. I NOTICE: Gasolines for Cleaner Air Your use of gasoline with detergent additives will help prevent deposits from forming in your engine and fuel system. That helps keep yourengine in tune and your emission control system working properly. It's goodfor your vehicle, and you'll be doing your part for cleaner air. Many gasolines are now blended with materials called oxygenates. General Motors recommends that you use gasolines with these blending materials, such as MTBE and ethanol. By doing so, you can help clean the air, especially in those parts of the country that have high carbon monoxide levels. In addition, some gasoline suppliers are now producing reformulated gasolines. These gasolines are specially designed to reduce vehicle emissions. General Motors recommends that you use reformulated gasoline. By doing so, you can help clean the air, especiallyin those parts of the country that have highozone levels. You should ask yourservice station operators if their gasolines contain detergents and oxygenates, and if they have been reformulated to reduce vehicle emissions.