Comparing New York taxis to the average non professional driver is like comparing apples to avocados. Taxis are driven constantly, hours at a time every day. They can get that 6,000 miles in just a few weeks if that long. Our cars might run 12 hours a day on a road trip not every day.
GDI injection tends to dilute the oil with gasoline. Unless you are driving 30 or more miles at a time on the highway on most outings, or check your oil at every fill up it is best to follow the extreme service schedule for oil changes, 3,750 to 4,000 miles and at least annually. My opinion, I follow on my cars, I hope I never have to go through one of those oil consumption tests because I let my engine run dry.