I think you know the answer about body work done in the past. Your effort would be better spent taking off the cosmetic job and seeing what you really have.
Something doesn't add up with your MPGs. I don't worry too much about that stuff because I pay for the work I ask my equipment to perform. If your Tacoma is performing for you then that's the price you pay. Maybe you are hauling, towing, pushing, or dragging. She is doing work of some type.
I say don't mess with a good thing. So, if Toyota were to listen to me, I would ask to keep their focus on the Mid-size market with the Tacoma model. Add more function to what has proven to function well.
Like when they added storage spaces to otherwise unusable cavities, add flat tray spaces on...
More often you will experience the truck rear end slide. A slide can introduce the opportunity for sidewall contact; perpendicular, no longer rolling. You can help yourself by turning the front wheels back into a rolling direction.
I was able to practice this on a slick track at a police...
I am constantly shifting 5-4-3 and back again 3-4-5. This Toyota Tacoma shifter is fun, functional and form-fit. My hand lands directly on it. With an easy slap left at 50 mph deceleration into 4, then tap down into 3 as I decelerate further through the 40's. As I accelerate into the turn I move...
Performance is priority for me.
My SR5 DC 4.0 is stock
My mileage will vary with what I ask of her:
Take me to work 21 MPG.
Go to Snowshoe, WV 18 MPG.
Haul 1000 pounds 18 MPG.
4x4 in snow 17 MPG.
Tow my boat 15 MPG.
She gets all those done without complaint. Pay for performance.
I did. It melted down. That is when I discovered the weakest termination in the harness. My LED bar light failed, pulled a higher load (but not enough to open the fuse). The conversion was actually a process of troubleshooting. I ruled out the adapter and then the next weak connection exposed...