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Umm. Not trying to be contradictory but I thought that since most new vehicles have computer management systems that they can "adjust" for almost whatever level octane fuel that's put into it. And that there's really no gain or effect if a vehicle that requires regular octane gets premium grade. It's essentially just a waste of money if the owner wants premium.

But the flip side is that if a vehicle requires premium and you put in regular that doing so can "harm" the vehicle.

I base my post on mostly what I read from my Lexus owners manual. My RX300 only requires regular octane but can use premium for "improved vehicle performance." Using lower octane than what is recommended can cause "persistant heavy knocking. If it is severe, this will lead to engine damage."

I also remember an article from Car and Driver that tested the diffs between grades and the results were that they were negligible.

Bottom line: I use regular octane in my 3 and mid-grade (for a little pinging) for my RX.

Sorry for long post. :eek:
 
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