Lots of cars over pushing 50 years now. GM, Ford, Chrysler, Toyota, Honda, even one VW in my much younger days (which did burn oil - bought used and apparently abused).What do you mean when you say that you have never used a car that used oil? And what did you use to measure compression? Did you measure each piston directly? What vehicles and engine types?
I would say that an engine uses oil if there is any blue haze visible in the exhaust upon starting or if oil is having to be added between changes. Yes, compression tests are run on each cylinder individually to check for cylinder-to-cylinder variability, high to low across all cylinders and to see if all are within spec and spec range (+/-) according to the shop manual. Easiest to do this when changing spark plugs. If there is a low reading, one can start investigating to determine if it is a ring, valve or a head gasket problem.
All I was trying to convey in my initial post was a "new car habit" of mine that has worked for me, similar to people's various opinions on how to break-in a new car. It was also a compliment on this new Toyota that I did not observe stuff in the initial oil change that I had seen with other manufacturer's engines.
Thanks - I'm done.