Anyone who wants to do accurate and meaningful oil consumption monitoring needs to check the oil, and make a note of the level, immediately after an oil change is done. This is actually something that should be done by everyone anyway, but very few owners ever do it.Actually, our CX-9 at close to 45K miles seems to be dong better, but not sure if it is because they are overfilling (going to dealer). ...
And after that initial check, regular level checks every 500K miles or so will result in a completely reliable history of how much oil is being consumed. And if topping off is required, check the oil again after adding oil, in order to record the new, higher level. Just remember to always wait 5 minutes or longer after the engine is shut down, before checking the oil level.