[aerohead]

Originally Posted by 93tracerwagon

Finally had some longer highway drive time and found out just what it could do. Full size Express Cargo 2500 running about 7500lbs GVW with 2.8 diesel, humid 90 F Outdoor, AC running. Was running behind a semi much of the time, but not too close, so that definitely helped. Hit as high as 35 for shorter stretches but at about 65mph over about 60 miles averaged out to about 33.3 mpg on the dash readout. This was running on fairly flat land (northern Il just west of Chicago). Came out to about 32.3MPG once I exited the highway in Chicago and hit local streets.

Not mods yet. Hope to get better shocks, some front end aero (grill air flow improvements, short belly pan) and get the tranny reprogrammed to stay in high gear below 65.

It's fabulous! I'll sleep better knowing things like that are available to the mortal man.
Appreciate the numbers.