Well my car's trip computer is almost always at 150 hours when I get to 5000 miles. ( my interval)

This last time it included a fast drive to Chicago so 5000 miles came up almost 30 hours sooner. My brother has a long highway commute every day, he can put 5000 miles on his car in two months, his car sees almost no city driving.

I'm thinking of putting an hour meter on his car for him, to see if this gives a more accurate indication of oil life. It could be more accurate for a city driven car as well, you could subtract some hours for heavy a/c use...etc. Joe