So what do you need? An F150 definitely has more capacity. Do you need that? A Ranger is more compact, is that a goal? MPG ?? If MPG is the focus and F150 vs Ranger are the choices, the real world diffrences cannot be measured. IF MPG is the issue, do not buy a pickup. Learn to hyper mile drive. Take off yer shoes.
Soo many factors go into MPG. If MPG are a factor do not lift it, keep the stock tires, do not add an RTT, do not add a winch bumper, ....... drive slower. F150, Ranger, Taco, F250, Wrangler, diesel/gas........ First pick the vehicle you NEED to do what you WANT. Then drive accordingly....... Learn to hyper mile and take off yer shoes.