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5.9 or 6.7? My brothers 6.7 6mt gets insane economy for a full size dually with a big wheel kit. Mid to high 20s with him driving like a fool half the time and not taking into account a 7" taller tire. Truck weighs 8200#s. He has two mods you don't, the electric fan conversion netted him a big gain and his tune. I can't say exactly because he doesn't check unless I force him to. But he notices when he starts getting more miles per tank after making a change.
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