In what little time I have been a diesel fan, I've learned of an interesting system that gives you better mpg as well as a little more power. It's called water/methanol injection and basically it increases combustion efficiency which equals more power and fuel economy. I think full kits cost around $600 and you can see a 20-30 hp boost along with a 4-6 mpg increase over your baseline. There's a trunk mounted tank you fill with the water/methanol mix and it's up to you when you want the system to be activated. I know it's a bit pricey, so i guess this is just something to keep in mind for later! Best of luck!
