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I use 91 (Premium). If there were gas stations with 93 or even 94 I'd definitely use some of that no matter what the price is. These cars respond really well to premium fuel. Its also recommended that you use premium fuel in the owners manual.
I put the 87 in the car when gas shot up to almost $4-$5 a gallon last summer and it greatly effed up my car.. .ran like crap.. Now I only us 93 Premium and I don't have any problems..