It's incredible the mileage gains that can be had with aftermarket tuning. They run really good stock but when modifying code they run REALLY good and pick up some economy boost as well.
I just heard today that I gave a guy an instant 2 MPG increase on his '02 CC dually...from 14 to 16. He's coming in for live tuning tomorrow so I can fine tune some shifting for him.
Thank you Bill for allowing me to serve my small farming community!