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2001 Prelude Type SH, 2011 Pilot EX-L 4WD, 2015 Subaru Legacy 2.5i Premium
Moderator - Buying questions? Please include selling price (not OTD), zip code and trim you are shopping.
In short, the higher the octane, the higher the pressure has to be before the gas spontaneously ignites. The PF has a "high compression" engine, and using low-octane gas could cause the fuel/air mixture to ignite before the spark plug fires. This causes loss of power and/or economy.
The web site does a much better job of explaining it, but beware, it can be addictive!
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