You are right. A 4 cylinder diesel and small pickup would make a nice combo.
The high price easily counteracts the gas savings.
Frank, the T-reg is supposed to be a competent tow vehicle.
The high price/fuel savings issue is interesting. Rather than comparing gas mileage figures, the real test is "ownership cost per mile" for a vehicle. That takes in depreciation, fuel mileage, repairs, and maintenance. I wish those numbers were published somewhere, but if the truck or car you're looking at has been around a few years, you can get a pretty good idea of future depreciation from looking at past depreciation of the same models in past model years.