re: Diesel Engine MPG question... i know im going to catch hell for this

The easiest thing to do with a tuner/programmer is increase the boost of your turbo or turbos. Increasing the boost of a forced induction engine can increase your efficiency and power.

By the way, a lot of guys are showing highway mileage being so high. In town you'll still get crappy mileage. But on the highway when you're in overdrive and you're at a steady low rpm, your turbos give your engine much more efficiency.

I would suggest a Banks tuner. My buddy has one on his old F350 with the old international diesel. It's putting down around 1200 foot pounds of torque.