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Originally Posted by Chesmu
that being said, using the 87 vs. 91 will save you maybe 100.00 per year. I think using the higher octane helps the car run better, and it's worth the hundred bucks for my (maybe erroneous) piece of mind.
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My understanding is that the higher octane fuels prevent knocking on high performance engines because they are more resistant to igniting before the sparkplug detonates (is that the right word?). Also, I have been repeatedly been told (for example, on my jetskis) that using a higher octane than required gas not only does not benefit me, it actually hurts the engine because it leaves behind more residue (maybe this is only a symptom seen when mixing with 2-stroke oil?).
Bottom line, its $100/per year that you are throwing away. Instead, send it to me. PM me for paypal info.