The Fortwo Smart Car is made by a division of Daimler (Mercedes Benz). It gets so-so mileage on PREMIUM fuel, for a small light car. The new Hyundai Ioniq gets 51 mpg on regular and holds 4 people comfortably plus their luggage, compared to the Smart Car's 38 mpg. Handling is mediocre, ride is stiff and interior is noisy. Seats are widely held to be usable for no more than an hour before causing extreme discomfort.
It is cheap and very short, making it an ideal city car. However, considering most of the streets in our cities are in rotten shape, be prepared for a teeth-rattling suspension (longer wheelbases absorb uneven pavements better). It also accelerates like a half-dead mule, making it dicey on freeway entrances like the one nearest our home, where the slow lane is going 70 mph around a downhill blind curve!
Storage is very good but the liftover in the back is unusually high*. It is specifically intended to be only an urban-use car: fits small narrow parking spaces, maneuverable with a 22' turning radius.
Cost is between $15-20K, depending on trim level.
* If you have back issues, be careful about this. Lifting heavy objects in and out can be a problem.