Ford does recommend premium for towing, especially at high temperatures. Not sure what effect that would have on the transmission but may have been able to hold a higher gear with the extra power available.
Different tires, even of the same size can make a large difference. With my 2.0 turbo Audi snow tires of the same size cause a loss of above 2.5 to 3 mpg.
Try holding the key by the metal (or something else metal) and touching the door handle with it. I have gotten some pretty amazing arcs that way and don’t get shocked myself. You may have to find some other grounded metal on the Maverick because I think the handles are plastic.
A lot of it...
The max pressure on the tire has nothing to do with the correct pressure. The pressure on the door jam (plus or minus 3 or 4 lbs, at your option) is the correct answer.
Just google for 2 minutes and you will see the truth.
Which would you rather have, a little easily cleaned wax rustproofing dripping out, or rust?
My 2000 Jetta still drips a little rustproofing wax on hot days, but it has no rust, even in super salty Northern Ohio.
I wouldn’t set the tire pressure at the maximum pressure listed on the tire. That has nothing to do with the correct air pressure listed on the sticker on the door jam.
It really seems to me that the very few times that the tri fold top covers the rear window that the exterior mirrors and the rear view camera would do the job.