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If GM would finish the 4.5 dmax and put in the half tons and tahoes that would sell like crazy. I have had 6 duramax trucks and have used everyone hard and they have been great. I had a 14 yukon denali I towed my boat with once. The 6.2 is a major improvement towing vs a 5.3 (had one 02 truck with one) but gas mileage sucks. I traded it for a new range rover with a 3.0 turbo diesel and love it. hauled a bunch of sq bales on a 20' AL car hauler back in the fall with it and I didn't feel it back there. torque out the ass (no horsepower lol) and goes 600 miles on 20 gal of diesel. I got a 500 gallon tank of on road at my house/farm so it made sense for everything diesel. my mower/tractors, 2 sxs and all my daily drivers are diesel. I could never go back.