Moto GP Racer
Join Date: Jun 2006
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All the manufacturers have jumped on board as far as suggesting top tier.
BMW recommends using TOP TIER Detergent Gasoline with a minimum octane rating of AKI 91. This gasoline also complies with the 10% or less ethanol requirement. It's a higher standard with enhanced fuel detergency that helps to avoid driveability problems. Ethanol is a type of alcohol which is combined with gasoline, primarily to reduce engine knock. In combustion, ethanol provides less energy than gasoline, resulting in reduced fuel economy. When ethanol burns inside the engine, it tends to form a weaker mixture that may cause misfire, rough idle and cold start issues in your vehicle. In addition, engine components may deteriorate over time when in contact with ethanol. Consequently, commercial gasoline is limited to a maximum of 10% ethanol.
The top tier gas...like Chevron, Shell, And Mobil all have additives that help keep your fuel system clean. They also seem to be regulated a bit better than the off brand stations are. This is why the vehicle manufacturers suggest top tier.
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Last edited by James06CBR; 06-15-2009 at 11:20 AM.