A lot of people miss this but Atto 1 is only a four seater.

It can't be a city car because many U.S. cities have surface streets with speeds of 40MPH. It can't even get me to my nearby grocery store because the road the grocery store parking lot opens onto is 45MPH. Many U.S. cities were cut up between the 1950s and the 1970s to allow through traffic by relocating state route highways and interstate highways into the cities. This had the knock-on effect of raising the speed limits of surface streets that connected to or surrounded those highways. The only places you'd be able to drive this thing without being a nuisance, a traffic hazard, or a focus for police attention would be the tiny portions of the cities that existed before the 1950s and were left untouched in the decades since. That pretty much rules out the midwest, the west coast, and anything on the east coast south of Virginia.

In the US, something like 39% of the population lives in an urban environment with a population of 50,000 or larger. That means 61% live in smaller areas. In my city of approximately 55,000, it is hard to make do with not leaving the to go to surrounding towns and that almost always means speeds of 45-55mph.

I'm a little unclear on what cities in the US are large enough that most people wouldn't need a vehicle that can go faster (for the sake of being allowed on the needed roads), and yet would be a city where enough people would want their own car for use inside of the city instead of relying on foot/public transport.

I think that most likely a successful city car in the US would still need to be able to do a minimum of 45mph, and I could see arguments for 60mph or 70mph as the minimum instead. I could see getting away with all the driving I do in a typical month with something that couldn't do more than 45 though. 19mph is too slow for my typical week, unless it took the form of a cargo bike.

Idk how big of a market pure city driving would be; I imagine most city traffic sources from the suburbs

Unless this is meant for like taxis, similar to auto-rickshaws in Southeast Asia. Or maybe short distance car rentals like zipcar?

Yeah but there are golf carts that go bigger and faster than this car. At about the same price.