My 2006 Dodge 3500 Mega Cab with a 5.9L Cummins engine has just over 155,000 miles on it and gets around 20 to 23 mpg. I have 22x12s XD Bombs wheels on 35x12.50x22 Toyo MTs tires with a 2.5 Rough Country leveling kit. I've had the truck for about 8 months now after buying it completely stock and at Scheid Diesel Extravaganza last year it made 455hp and 900 ft/lbs. of torque on a non-loaded dyno. It’s a work in process but other exterior modifications that I’ve made to it include Spec D black headlights and taillights, black mesh grill, color-matched grill shell, Rhino liner, bumpers and mirrors.
Under the hood I’ve added a Stage 2 aFe intake, rebuilt the transmission, added an H&S XRT Pro programmer, plus a 5-inch Flo Pro turbo back exhaust with an 8-inch tip. And to top it off I put a Pioneer Double Din Hertz 12s in ported box behind seat.