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Old 04-28-2014, 03:46 PM   #29
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10.5 US MPG when towing with my '03 Tahoe (5.3L, 4x4, 3.73 gears). 15-16 mpg without.

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Old 05-01-2014, 11:51 AM   #30
Join Date: Feb 2013
Posts: 72
Got one figure, yesterday, that may help. With mods listed two posts back, on interstate, not towing, AC off, windows up, tailgate on, no appreciable wind, traveling at 66MPH on relatively flat road, I was seeing 18+. Keep in mind this is a 4x4 dually, with 2" Fred's dually spacers and wider and more aggressive tires than stock.

Big Okanagan on a big 4x4 Ram 5500.
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Old 05-18-2014, 05:21 PM   #31
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Originally Posted by CJBROWN View Post
My duramax was a '04. It was said on the durmax forums they got the best mileage of any of them. I ran hypertune stage 3. It would get 22-23 empty and 14 towing 5K lbs. Sometimes I would switch it to stage 2 for towing due to stock exhaust and fear of over temp on EGT's.

Killer truck, best one I ever owned. Don't have the boat anymore so it sold. But it would tow that silly boat up the pass at 85 if you wanted to. Stupid torque and horsepower. The newer ones are already chipped to those settings, but don't get quite the same mileage due to emmissions crap.
Hard to understand why anyone would care about soot and nitrate emissions from engines. Who really needs to breathe anyway? And they don't want me tossing my garbage out on the street or putting my motor oil down the sewer drain. What is the world coming to?

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