The old Duffer
the oil is burnt more on a worn engine as it is able to pass the piston rings and the valve guides into the combustion chamber where it is burnt along with the fuel/air mixture.I suggest you keep an eye on your oil consumption.and check it after a long journey.
This is not an indication that the engine is on its last legs, just that certain clearences are somewhat larger than found on a new engine.
Alvin