I am going for a bit of both. I will have to tune it up good because the truck is heavy just so that it drives good. That is all I am after. The engine is not big enough to make a "performance truck" out of this Toyota.
The thing with diesels is that you can tune it for lots of power then just change a few things while driving to get your economy as well. Not like a gas where you are stuck with mandated mixture (14.7:1)
This is what VW did with the "eco-diesel". These engines have a modified (missing some parts)pumps that don't add more fuel based on boost pressure, therefore you don't use as much fuel. So If I wanted to I could close off the boost enrichment circuit (air circuit) and run very lean when cruising. Then turn it on when I want to go, voila, power.
Some guys use boost controllers for this. With a diesel you don't have to keep the mixture so perfect, just lean it out and cruise to the "clatter"
