My car used no oil during its first year of ownership, but has only been an issue since the oil was changed, in the summer. It has now done just over 100,000 miles. I use X-Tech 5W-30 fully synthetic motor oil. It seems to drop down to midway between Full and Fill then just sits there. The car gives no signs of burning oil. Performance is fine, fuel economy is brilliant. Plugs are clean and a great colour and the exhaust is clean with no smell of oil (I reverse car into garage, every night).
Yesterday I added oil to the cold engine, didn't check level as it takes a time to settle into sump, went for a 40 mile run and this morning I checked it cold once again. It was spot on the full mark. I'll see where it goes from there!