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as a rule low grade is ok, 10% alcohol max, but in some western and mid west, alcohol free gas can be found, it is usually premium. after a few tanks the engine control will adjust and there will be a mot more power, the alcohol really waters the gas down.
now for moutian driving ( especially colorado) i will begin to switch to premium as low grade gas will run ( colorado gas has a lot of EPA additives) that drive up cylinder temp. causing much hotter running engine which can be a problem when having heavy loads in summer temp.
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