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Really depends on where you live. I know that in higher elevation states 89 is the typical 'Premium' gas so you have no option there. The car can handle 91 octane just fine but just expect to be short of some power because the car will change ignition timing to account for less compress-able fuel. Myself personally I run 93 octane from BP which is also E10. She's running fine and I've never had the crickets in this gas (Probably just a correlation and not causation but wouldn't want to mess with a good thing) so I've never changed which gas station I go to unless it's on a long road trip. Even then I strive to find a BP with 93 octane. I'll grind my teeth when I have to fill up with 91 and/or 92.
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