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thinking about trading my 2019 6.7 and getting a 6.4 with a 8 speed. Wanna see if any of you guys are getting for mpg towing with a 6.4 and 6.7, ill be towing a sxs (x3 max on single axle trailer) weighing around 3-4k I would think a boat that wait will yield same results. Reason i ask is I...