12.0 L/100km, so I guess can gallons. Just have a "easy fuel mileage calc" slide in the truck. Would be = 20.5 with imp gal. My brothers chev 3/4 crew (6L) gets 14 empty, and my buddys 07 Tundra (5.7?) gets 13 empty, so still pretty sweet.
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05 3500 6 spd, QC, SB, SRW, 3.73, superchip, K&N cold air, exhuast, 2 " leveling, 315/70/R17 BFG AT, home made bumpers, 15000 lb warn, quad deck.