I have a stock '16 XL CC 4x4, with 3.31's. @ 6,000 miles, my lie-o-meter shows 19.1 from day one with occasional light towing. Mostly used as a drive to work rig, 20 miles one way on a two lane highways @ 60mph. Hand calcs show about 1 mpg less. It gets about 1 mpg less than my Toyota Tacoma...