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Most of my driving I did it with super 93 octane. However, as you mention because of the higher gas prices I started using regular. To my surprise this got me more miles per gallon at 70mph (I got 32 all the time) then when I using SUPER 93 (I was getting 27 mpg). I did not notice any change in performance either.

Notice that the manual said premium recommended not require. According to Consumers Reports you can use regular when it says premium recommended and super if it says require!

You guys have to be the judge for your own car!
 
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