For what it’s worth, I have a 2011 Tundra with the 5.7 engine. It has 160,000 miles on it. I have towed an 8000 pound trailer from Montana to Southern California to Fairbanks, Ak and back to Montana, and to Bella Coola, BC, and back and forth to the Olympic Penninsula. Shook the plates loose in three batteries in a row.
Repairs to this date are a set of rear brakes, a windshield or two and a set of windshield wipers. The truck is starting to develope a minor rattle or two. At 125,000 it was tighter than our brand new 2014 3/4 ton Ford.
Mileage has ranged from 8 mpg towing into a headwind, to 19 on level roads driving 60. Highway mileage is usually 17. That seems to drastically improve, up to about 19 when I get gas south of Montana.
