Quote:
Originally Posted by D
Well - nothing personal man, but there are obviously a few things you don't know in regard to Octane levels, because they have absolutely no bearing on mileage. High Octane and Low Octane fuel contain the same amount of energy - it's just, as I said, speed of burning (the injectors still spray the same amount of liquid in the cylinder): High Octane can withstand pressure more than Low Octane can without destabilizing.
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good technical info with a caveat added:
many (most) modern cars have computer chip systems which will tweak (advance or retard) ignition timing to offset detonation to prevent knocking in the event you put low octane fuel in a high compession engine.
when ignition timing is retarded both performance and gas mileage will suffer (slightly.)
it it true that putting premium fuel in engines not needing it will give no performance benefit, but the converse of that (putting low octane fuel in high compression engine) will erode performance .