1st tank of fuel last night. Figured my mileage (361 miles on 19.61 gallons), 18.4 mpg. All I can say is WOW. The DIC was off about 1.5 mpg, but who cares. That is the same mileage I was getting with my 4.8 gas burner in the same driving conditions. I'm interested to see if it get the same on a road trip. The gas burner would get around 23 (70+, air on, unloaded). I know the diesel will blow it out towing.
John