You must not live in an area that has long grades and/or steady wind. Our 2020 4Runner on Pro wheels, standard size AT tires, 1 to 4 passengers, and 0 to 100lbs in luggage routinely does it between 60mph and 85mph here in the Midwest where grades a minor but really long and winds ranging from 10mph to 20mph (often times much worse on the Plains).

This whole hunting issue could be largely addressed with just a couple lines of code in the TCM to tell the damn trans to unlock the torque converter in 5th on mild grades rather than going for 4th. TCM and ECU see a change in vacuum in 5th when going up a minor incline and assumes you're getting ready to climb a mountain. LOL. So dumb that they can't fix this and it's been this way since the 5th gen was introduced 100 years before Christ himself.