Some interesting stuff on milage for diesels http://cumminsengines.com/assets/pdf/MPG_Secrets_Whitepaper.pdf

I should add that to the download area if I haven't but yeah it points out a lot of good information mostly the spped factor is the big one...

I read that a few years ago, there is some good info in there.

Yeah, I read that a while ago also. Slow down, keep your foot out of it, use worn out tires etc. etc.!!!! It's good advice though!!!