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My 2011 Chevy 3500HD on a 6,850 trip averaged 9.5 mpg to 12 mpg towing 17,500 lb SOB we travel light, load capacity is 18,500 lbs. The bobtail mileage was 14 mpg to 20 mpg. Would I like better sure I would, however with 397 hp and 765 lbs torq I think the mileage is good. I haven't checked the new 2012 Chevy 3500HD its basically the same Truck, with the except I have a CM hauler bed with a in-bed 45 gal fuel tank, which will make the Truck weigh more. With all the emisson control system I think the mileage is about as good as it get.
As for adding a gadget to get more fuel mileage or HP/Torq, I really believe if there was such a thing GM would have added it years ago. The cost of adding a gadget and the danger of destroying a $12,000+ great power plant is not worth the effort. Don't make a lot of sense. As most know I don't believe in adding gadgets to perfection. I believe its snake oil.. Happy Trails.....
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