I think I'd go for VW's one liter car.
I would be happy with the following. VW's One Liter Car, The Aptera, A Pulse (there's something similar to this with retractable outrigger wheels, that's what I really want), or a Mazda Miata. No, the Miata isn't really an economy car, but I had one once and I just love the hell out of those little things.
I suppose I wouldn't mind a Smart either.
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