That's not extreme amounts, although ours went from similar quantities back to using virtually no oil when I fixed the PCV valve that was stuck and vacuuming it out of the crankcase. Did you check that? One indicator was a little oil on the bottom of the air intake mushroom.
Our oil definitely was looking used after similar oil change intervals, but if it's not, why worry - just means your piston rings are still in good shape and you have minimal blow-by, or perhaps you poured in some extremely fancy oil?
Do you occasionally run the engine at full throttle (as you IMHO should to clear buildup and the mixing elbow) or never?