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Old 03-15-2016, 08:05 AM
HoraceRider HoraceRider is offline
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2001 Quest
 
Join Date: Mar 2016
Posts: 1
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here is a piece of non Quest information, which applies to all engines. It may come as a surprise to some that there is no difference in quality between regular and premium. The only difference is that the higher the octane, the greater percentage of longer molecules in the mixzture. With all things being equal, the higher octane burns more slowly than the lower octane. It is needed in higher compression ratio engines because increasing the compression speeds up the burning, and when it burns too fast you get detonation.
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