I just stay stock, went from 13 mpg to 20 mpg. I've got a kc stage 2 turbo.If I had to do it again I would probably go with 155cc with the smallest nozzle I could get. Definitely upgrade your turbo if you haven't already. You won't like your EGT's if you run larger sticks with a stock turbo.
No I had the turbo on when I got 13 mpg, the only thing I did what the injectors. This mpg is hand calculated to.So, 323Flint, do you attribute your increase in fuel mileage directly to the upgrade in your turbo? I've only run one tank of diesel through my truck since I bought it (92,xxx miles on it), getting 12.3 mpg. I'd love 20 mpg. Sea level for now, Gulf coast, but intend to travel the nation.