mpg?...MPG? 
Are we talking about a Hummer? When I decided on a Hummer (for 5 seconds I thought about the Prius  ), the only times the mpg came into thinking was H2 vs. H3 (H3), stock vs. after market air intake (so far stock because the dynocharts conditions are not how I drive), and new exhaust system (probably coupled with a cold air intake but awaiting the dynochart results on the Magnaflow web site). Mpg? Furgetaboutit!
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H3Bas'r: Ready-Lift Levelled Superior Blue (debadged), Sun roof, Tinted, Mud mats, Wakizashi, front Husky flaps, Manik rocker bars, UCS, Tom Tom GPS for Treo, SuperSwampers Radial TSL, Rear Eaton Locker, PCMforless'd... but, alas, not waterproofed
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