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Around here there is a 30 cent difference between 87 and 93. I've never seen 30 cents between 91 and 93, but maybe its that way in Arizona.
While yes, the SS will run on 87, it will reduce performance significantly. Also note that when reducing performance, usually mpg suffers too. So, you can actually spend more money on 87 than on 93.
Putting anything other than the recommended fuel in the car is just stupid and a waste. Let's say you burn 20 gallons a week, at a 30 cent difference. That's $6 a week for the proper fuel. that's an extra $312 dollars a year. You figure most people have payments, and when you plug that into the overall yearly expense, these cars probably cost everyone at least $4K-$5K a year, whats an extra $312?
The bottom line is, premium is recommended, so that is what I run. And, that is what everyone should run, and if you are that worried about a few extra dollars a fill up, then you bought the wrong car.
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