Use it in my boat regurlarly haven't really tried it in the Hummer. Haven't really had a need to. Seafoam is put in the gas tank when you have water in it. Also people use it when winterizing boats and in spring when take the boat out again.
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Black, ebony/cashmere, sunroof, chrome pack., chrome wheels, 6 disc monsoon, DVD syst, ss nerf bars
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