My DD gets about 500 miles a week for commute. My truck gets like 10--sometimes it sits for two weeks, sometimes it gets 10, other times it will spike and I'll do 200. I think the last year, two years each got about 25k and 6k respectively. Wife's car has been getting less lately, like 22k/year, whatever that works out to be.
Oil: Started with TGMO 0W20, have been migrating to cheaper 30's since then. First Mobil, then some 10W30 PP that I got on sale. Now it'll likely be ST 5W30--maybe 10W30 summer and 5W30 or 0W20 for winter, but on a 5k OCI. Except the old Camry, that will probably stay 5W30 year round, and on high mileage oil as that seems to slow down a leak. Not sure that super duper oil at long OCI's make sense once engine age gets up there. Not sure it really matters one way or the other.