A couple of years back i read news in the paper that a man in usa drove 2014 model tundra 999,999 miles and the odometer of the car could not go beyond 999,999 lol.
So when he went to buy new tundra 2016 toyota gave him that for free and took his old tundra to reverse engineer it and see how that car still looked new after driving so many miles. He only ever g9t consumables changed thats it.
He was a telecom engineer and his sole job was to stay on road and fix things town to town.