Thread: unleaded or primium gas?
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Old 09-22-2005, 05:22 AM
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H3ProspectKy H3ProspectKy is offline
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Join Date: Jul 2005
Location: Prospect, KY
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I use regular, as recommended by HUMMER. I believe other owner's have compared premium and regular fuel in their H3's, and found no improvement in mileage or performance (in earlier posts).
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