Ford and Chevy get all twisted up

When you're talking about a truck in the class of the F150, "a few (hundred) pounds lighter" is HUGE because the limiting factor on these has always been payload payload payload. Now you are looking at nearly 2000lbs of payload capacity in a typical truck instead of a hard-to-find-without-ordering, stripped-down model. You can tow that 7000lb bunkhouse with the 1000lb tongue weight, and bring along your wife, the three teenage linebacker sons, and the St. Bernard without putting the truck several hundred pounds over GVWR and probably exceeding the rear axle rating too.

When your F150 is also your daily driver, "slightly better MPG" adds up too. If you're only driving the truck to haul the RV somewhere it's not such a big deal, sure.