Gas $3.12/gal - What have you done to improve MPG?

[jracca]

I am working on swapping a cummins 4bt 3.9 liter diesel into my truck, for reliability, power, and longevity, as well as the fuel savings, especially the fuel savings.

Running an overdrive transmission is a huge boost to fuel economy based on my experience. I was getting 8mpg with a 4:10 rear on the highway before I switched to a 700r4, and was getting 14+ mpg on the highway. For comparisions I was running a 350 v8 with a quadrajet carb. Having the truck properly tuned can be a big boost, as well as keeping the tires aired up to the recommended pressure. The 700r4 is not a difficult swap at all, I would recommend it to anyone who uses their truck on the highway that is runnig a th350 now.