This has been typical for me. Towing my 22ft bumper pull toy hauler that weighed about 10k on this trip. No wind over flat and some rolling terrain. XLT 6.7 with 3.55 gears. About 1000 lbs of gear including passengers. Truck has a 2 1/2 inch level and 34.8 inch tall tires. I know the “keep it stock”crowd will be all over