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Everything I've read about the Smart says the same thing. Weak engine, lousy transmission, jerky ride, mediocre gas mileage considering its size.
Just because a car is small doesn't mean it has to perform as poorly as the Smart Car. Some company needs to take the concept, put a decent engine-transmission combination in it that is frugal with gas and try again. There's no reason a car its size shouldn't be able to routinely get in the 40s or even 50s if designed well.