Kfx & Desert- I thought mileage was impressive also. I need to take a few more long haul trips before I start
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I've only done one tow to a campground about 45 minutes away. Kept it in the 'stock' setting. There's a decent hill we have to go over and usually she downshifts. Not this time. Went right over in 6th gear. Did take some boost, but she didn't loose more than 2mph.
One problem I've noticed. When I cancel the cruise and press the brake to come to a stop, the exhaust brake doesn't always come on like it's supposed to. May not get to go camping anymore this year to test it out further.