Funny you mention that. We know you're a long distance traveler,
John U, but despite the frequent stop-start-stop-start usage of our vehicles in primarily non-highway environments, we only get trace oil consumption as well on Mobil 1. Pretty much a ditto with your experiences, man.
Not unusual for us to exceed 7,500 miles between oil changes, and only use, maybe 20 ounces of oil between changes on our ancient Odysseys (one passing 185,000 miles, mine passing 180,000 miles). Cold starts and driving while warming up, before everything is up to operating temp, is a recipe for consuming oil, yet Mobil 1 definitely exhibits less consumption that the Castrol GTX we used to use.
I don't know if we'll get to 300,000 on either van, but I'm sure if the other major pieces on our vans are able to hold up that mileage, the engines will easily make it. When I last removed valve covers to adjust valves, the valve train and other visible areas looked remarkably clean (relative to other engines I've torn down).
My next oil changes on our lawn tractor (B&S Intek) and lawn mower (Honda GVC160-powered) will be Mobil 1. Our local powersports dealer put Mobil 1 into the crankcase of our generator (also Honda-powered), and it has always performed when needed.
Like
dave mentions, good filters can only help. I have to replenish my supply of AmSOil Ea15K20 filters.
It all adds up to less worry. I know Mobil 1 performs well. Yeah, I sleep better, too!
OF