6.0

you say u drive a lot. What is considered a lot? If you really wanna build it up why not purchase a cheap fuel efficient DD and build the truck as $$$ allows.

Other option is get a D-max. Lots of power can be had, reliable and more fuel efficient. Just saying.
 
high that explains it. I used to put 25,000 miles a year. That's a lot of driving! One of the reasons I bought a diesel.