I tow about #7000 almost every weekend 550 miles round trip through mountain passes. With 98 F150 4.6, got 9 mpg towing, screaming at 5500 rpm a lot of the time. 2016 F150 2.7 Ecoboost, 13 mpg towing, mostly at less than 2400 rpm. 2020 F150 3.5 Ecoboost, 14 mpg towing (also 10 speed), rarely over 2200 RPM.
Put 268K miles on the 98 4.6, 69K on the 2016 2.7, and so far, 8K on the 2020 3.5.
I'm not afraid of the new fangled turboed V-6's... they make millions of them FFS. (BTW I only sold the 2016 2.7 because my buddy had a good year commercial fishing, and wanted to buy it from me for 5K over NADA)
