Greetings;
I have a 2001 3500 drw 4WD six spd. HO. During the summer I get 16-17 mixed driving. Winter im getting 13-14 mpg. Thats with 800 to 1000 lbs in the box at all times on goodyear armour-steel radials. I would probably do better with a less agressive tire tread.
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