I have used regular and premium. with regular I get that nasty engine rattle and I don't with premium. The next issue is ethonal in the fuel 10% and they tring to pass a law in Wisconsin that all gas have at least 10% my manual says don't use it... but otherwise I get about 45 MPG. I use premium almost always.
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02 Drifter
Thunder Air Kit
PCM III
78 KZ 650
79 KZ 650
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