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2001 Prelude Type SH, 2011 Pilot EX-L 4WD, 2015 Subaru Legacy 2.5i Premium
Moderator - Minivan fan. Feel free to message or email me - firstname.lastname@example.org.
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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