No. The cheapest miles you drive are on the mostly depreciated but reliable and well-maintained truck.
Your current strategy of going out of your way to drive the old truck (within reason) is best. I'd try hard to keep up the cosmetic appearance. Realistically that is what will take you out of the truck,
Going forward I'd think about going a different direction than a truck, My opinion is car #2 ought to be able to do something car #1 can't do. Better mileage, better handling, something.
Your current strategy of going out of your way to drive the old truck (within reason) is best. I'd try hard to keep up the cosmetic appearance. Realistically that is what will take you out of the truck,
Going forward I'd think about going a different direction than a truck, My opinion is car #2 ought to be able to do something car #1 can't do. Better mileage, better handling, something.