I would say that you would have to really sit down and run the numbers. I played with some quick numbers and honestly you probably wouldn’t save any significant money (over the short term assuming you finance). Any money you save on the truck’s maintenance will just go to the car’s maintenance, insurance, or financing. As long as the truck doesn’t rust out it will probably last you 20 years.
If you can afford to pay cash or buy a beater for around town (and save the truck for long trips) you might come out ahead.
Any kids in the picture?
14 mpg on a truck that size pretty good.