Why at highway speed though. Wouldnt 8th gearbe the same with either configuration?Actually the lower gear set ( higher number) for towing has a more minimal effect on stop and go vs. a more pronounced loss in mpg at highway speeds.
So yes 4K towing effects mileage all the time, but especially on the expressway. If I had to guess, I’d say a difference of likely 1 mpg especially at speeds over 45. And that’s with everything else being stock. Add in increased wind resistance from lifting your truck or increased unsprung weight like adding heavier tires and the effects are even more pronounced
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