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Originally Posted by Michael1  I've searched the forum, but only found a comment here and there for an unaltered, stock engine with all emissions equipment. I was wondering if some people could share their city and highway mileages (and speed on highway) unloaded. I checked Consumer Reports, and their mileages for the Silverado 2500 Duramax were 9 and 21 (no speeds given).
Thanks.
Michael |
I have a 2005 crewcab, short bed, 4X4 all stock. my unloaded mileage is 20-22 MPG driving 60-65 in rolling terrain. I tow a 10K-11K pound 5th wheel and average 12MPG driving 60MPH in rolling terrain. In flat interstate conditions, my towing efficiency increases to 14MPG. In mountainous conditions, efficiency deteriorates to 9-11 MPG.
Terrain and wind conditions, as well as your driving style, will have a significant effect on efficiency. You should also check your tire pressure. I operate my truck and 5th wheel at max recommended pressures: 80-psi in trailer and truck rear wheels; 55-psi in truck front tires.
tatca
2005 LLY, crewcab, 4X4, all stock