V6 or V8 vs. 4 cylinder trucks;
With the new lighter weight aluminum bodies, the F 150's base engine now is a 3 litre V6, and fuel economy very good. I think it has an eco boost turbo standard.
All wheel or 4 wheel drive adds weight and also reduces fuel economy.
It's relative to cause and effect, but you can always make money with a truck, and if some of the fuel is "still?" tax deductable as a business expense, even better.
I think the mid size Ranger may also be coming back from Ford. GM already brought back the Colorado and Canyon miodels.
Sedans will also come back, but I think most will be all electric, or at least be offered that way.