I always use tow mode, that's what it's for. I find that even though the engine is revving higher, it seems to not be working as hard, and I get slightly better gas mileage.
Last year I was pulling the trailer out of the winter storage yard, pressed the tow/haul button, and nothing happened. No light on the instrument panel, no transmission downshift, nothing. When I got home I did some Google searches, read a couple of websites and watched a video. It was just a simple broken wire in the steering column. I spliced it back together and all is well.
Geoff & Jill
& Sierra, the little white monster
2013 Ford F-150 XTR SC Ecoboost
2015 Jayco Jay Flight 24FBS