the bear II wrote:
For many years I chased the better gas mileage when towing. Then I decided to sit down and do some hard calculations.
I agree with this thought.
Forget about the mileage thing unless you tow and camp A LOT. It doesn't pay off to switch trucks from gas to diesel just for mileage if you are basically a close to home weekender or take an occasional longer trip.
Yes, diesel have more torque and power and will pull harder at lower RPM's. If your current truck does the job and you don't camp a lot, then financially it makes more sense to stick with what you have.