Quite a lot, actually. Certainly relative to almost all other areas of the country the rate of car ownership is low, but the streets are so packed with parked cars that many vehicle owners are willing to pay for private storage with monthly rental rates that are typically between $450 and $600.

My impression, though, is that most car owners are not using their cars for intra-Manhattan travel, which is what Uber is doing a lot of. Rather they're using their cars to travel to NJ, upstate NY, Long Island, or other areas where taking an Uber isn't practical.

Low as a percentage but still significant. According to this (http://www.nycedc.com/blog-entry/new-yorkers-and-cars) only 23% of Manhattanites own a car. Of course, that's still a lot of cars and also doesn't account for commuters driving into the city.

If you own an apartment in Manhattan and a house somewhere else, and have a car at the somewhere else (which is very common), would that count as a Manhattanite owning a car?

Nobody drives; there is too much traffic

Perfect! RIP Yogi Berra.

The ; makes this statement sarcastic. Too many driving.