The reason I purchased a Diesel powered vehicle is to be able to eventually run Bio Diesel fuel instead of Arab oil as fuel. There must be some of you out there that are using it today. The link below is a great resource for keeping up with this wonderful alternative fuel!
I just bought an 03 2500 a couple days ago. On the 120 mile drive home going 80mph I got 14 mpg. I went and bought some Lucas and threw it in there and refilled the tank. Yesterday I drove 270 miles and averaged 18.7mpg and that is with about 50 miles of in town driving and 220 miles of freeway driving at 80.