I blieve I'm on the AV flash is there a newer one? My mpg have not improved with the Hypertech or with the MP8. Just wondering if a different flash might help?

The newest flash available for the 07.5 6.7 is the AZ. I got it about a month ago and have noticed an increase in fuel economy. I believe they did this by making adjustments the the regen cycles... making it regen more frequently but for much shorter time intervals. It is now to the point where there is a negligible difference between having the EGR plugged in vs it being unplugged. Dodge probably figured out that most of us have been doing the unplug.

The chassis and cabs have a different flash to them, A standard truck flash could damage the engine on a 3500 / 4500 / 5500 C&C.. The engines are down rated in power for the work truck..:(:(