Can you clarify those charts? Do they represent the % of residents of CB8, Manhattan, NYC, and so on? And was the question "How do you get to work"?

As for the CBD, that's mostly not CB8, right? So if you're asking about car usage in CB8, it's probably not the case that people are driving to work in Manhattan, although they may be reverse commuting somewhere. Truthfully, you've got a small pool of people to work with in CB8 on the car issue, since it looks from the top most graph that ~62% took public transportation, ~18% walked, and another ~7% worked from home. These aren't quite the right numbers, but that leaves you with about 13% of people who took some kind of car.

So I think your time might be better spent on talking to the people who are in the cars that are driving around CB8 on any given day. Why are they there? Where did they come from? Could they have taken mass transit? Most likely these are not CB8 residents, but right now you probably don't know who they are, and it would be enlightening to see why people come there.

Yes, the Census Question is something like your "Primary means of traveling to work" for only people with employment.

And Yes, since CB8 only has about 230,000 people and of that about 130,000 or so are employed, they make up a small fraction of the drivers - probably less than 10,000 of the 600,000 that drive to Manhattan's CBD from north of 60th Street.