I find that to be completely true-- the area around my office is completely void of Car2Go cars from around 4 PM later. I had to walk ~1/5 of a mile to get to the nearest one. Of course, I'm sure at 1 AM that you'd be able to find a parked car pretty close to you, provided you're not by a bunch of offices which have had the cars driven away to residential areas by people at their jobs.
In what way is ~1250 feet considered a far distance to go for a rental car? Even in a populous metro area that seems about as short a walk as I would expect, are they generally closer?
It's not a typo, but it is 90 degrees today, and I'm sure many people would prefer to be able to be either picked up or go around a corner to find a car.