mine does! If I travel at 75-80 mph for 5 hours, it will consume more oil than those 5 hours of city driving.
Gary, you said:
"One would also have to be conscious of if the consumption is linear or accelerating as the OCI progressed."
My car is like that. It consumes 0.5 qt the first 3,5k miles and after it uses 1 qt for 2,5k miles and after a while, its 1 qt per 1,5k miles. Its always like that but only with M1 5w30. When I tried PP, it was 1 qt per 2,5k miles linear.
I have to say that my car starts early in the morning and stops late at night. In between, there's about 20 cranking and I drive about 100-300 miles a day.