I just towed with my 2017 Z71 4x4 long bed diesel Colorado for the first time. Temecula, CA to Peoria, AZ and back with a 6x12 Uhaul weight 1,800 lbs, fully loaded and the bed of the truck loaded as well. I figure it was about 4,000 lbs. 350 mile there an 350 back over 36 hours. 75 mph most of the time. No problem getting to 85 to pass whenever I needed to. I was in tow haul mode with the exhaust brake on all the time. Got about 17 mpg on the way loaded, but only 15 on the way back unloaded because we were heading into the teeth of some pretty bad wind all the way back. My main question is should I be in tow haul mode with the exhaust brake on all the time when towing, or is there some reason to be out of tow haul mode sometime when towing when not on hills on mostly level roads at speeds over 70 mph? Does the weight of the load dictate that I should always be in tow haul mode? Thanks in advance for any and all replies.
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