A few questions

[thedieselguru]

I know that there are different calibrations for 250/350 and 450/550 trucks. Have any of you played around with the 450/550's much? What are you finding different about them? Are they different to tune or are the maps pretty similar?

Also, my work truck is a 97 F47 with a manual trans. It hits the scales for about 12k but the 4.63 gear gets it moving easily. Problem is, 9 mpg! 45mph is around 2000 and 70 is over 2600. What would be done in tuning to help mpg's? I'm working on getting the boss to turn over the funds for minotaur and use this truck for a learning project. Hope to be purchasing this month so I'm trying to get a feel for where to start.

Thanks
Roger