Not like I stole it, thats for sure. Just passed emissions. In AZ on heavy duty trucks over 8000 pounds GVWR, they put them on the rollers for loaded 5 gas.I don't know how you're driving, but I was getting that kind of mileage out of a 2009 F-350 V10 while towing 10,000 pounds.
Passed with flying colors so I dont think theres a tune in it. Been filling up with Chevron 87 as well.