The elusive 10 mpg.

I've been waiting for this post to show up... I just got back from a 2 1/2 week -4500 mile trip down to Fl and back and my mileage just downright sucked. It was so bad I tried everything I could think of to improve it, I switch grades & brands of fuel, I hand figured the mileage BTW: the truck computer was dead on accurate (1/2 MPG), I varied the speeds, my methods of driving, nothing helped much. Best I can tell is; when I left NH it was in the single digits to low teens, the engine must have richen the fuel mixture as the exhaust pipe was black with soot and the tires never got warm at all (7.5-8.5 MPG). As I got further south and it started to warm up (in the 30 & 40s) mileage got better now up to 9-9.5 MPG. Once in the warm weather of FL (70-80*), I finely got back to 10-11 MPG and the exhaust pipe turned white again.

If you guys, recall, I'm the one who boosted that by putting my Kayaks on the roof of my truck I got 2 MPG better mileage... Well, this trip they didn't help me at all, I was ready to throw them off. Maybe I'll try them again next summer.

I have a 2013 F150 Ecoboost HD pulling a 9K Cougar 321RES. The truck did a fantastic job towing the trailer, an excellent combination. The trailer sway control is impressive, it was activated 6 time on the trip (30+ knot wide winds) as well as the integrated ABS sure save the day with a hard panic stop in DC.