OK, I'm officially in love with the EcoBoost. After towing a tortuous 100 miles in the Ozarks, with lots of hills and curves, I learned that the tow/haul tranny is smart enough to know how fast you want to go. You tap the brake to get to the desired speed on a downgrade, and it will downshift appropriately and hold you pretty close to that speed. Today's 160 miles included some divided highway with some fairly steep grades to pull. One of them tempted me to step on it to see what it would do. It promptly climbed to 70 mph at about 4000 rpm. The 5.3 would have been doing 4000 rpm, to maybe hold 50 mph. Mileage is still running just a little over 10.

Buffalo River