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

I read about people getting huge between-overhaul mileages out of diesel engines, one fellow just wrote about getting 368,500 miles from a Cummins diesel and I’ve heard about truckers running diesels well over 500,000 miles. Some of this is to be expected since diesel fuel is also a cylinder wall lubricant, whereas gasoline is a detergent. Nonetheless, this leads to the question, what kind of between-overhaul mileage can one expect to get from a well-maintained large bore gasoline engine? Years ago, gasoline car engines wouldn’t go much over 100,000 miles without a major overhaul. My last 1998 V6 Caravan engine was still running great at 286,000 miles without ever having been overhauled. I realize that car usage is a lot different from truck and RV usage, but I still have to wonder what kind of between-overhaul mileage these large V8 and V10 RV engines are capable of, assuming that they’re well maintained.

Steve