Between-overhaul mileage of a well maintained RV gas engine?

For the most part, the engine will outlast the house part, maybe except for full timers. I know a guy who spun a rod bearing in his 8.1 Workhorse at just 81,000 miles but that seems to be an anomoly. Many go 200,000+. The durability gap between gas engines and light duty diesels seems to have shrunk somewhat.