I have a 2011 Tundra towing around 10,000# and from Richmond, Va to North Fort Myers, Fl I got 11.061 MPG. I guess because I was going downhill with cruise set at 61 MPH. I did not check on the way back until I got to Savannah, Ga. From there home I got 9.196 MPG.
If I would go by the onboard computer that calculates the average MPG and not reset when I fill up with gas it would show a higher value which I know is wrong. I calculate my average MPG by dividing the total gallons of fuel used into the total miles traveled at the end of the trip.
Duane & Jan
2016 Crusader 295RST FW
2011 Toyota Tundra iForce 5.7 Limited Double Cab 6 speed automatic 4.10 gears