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Re: Topping off fuel?
On my GS there is a sticker on the fuel door that says "Premium Fuel Only". Gm would'nt put it there unless its absolutely needed. It increases the overall operating expense for the lifetime of the car. I dont have an AutoTap to check KR. At times it does feel a little slower. In Nevada 91 is the new Premium. I've always used 93 up until a few monthes ago. Once I was nearly empty and put about 5 gallons of 100 octane only. I think there was a slight differencein performance at WOT.
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