Cheap to run, and with excellent spares support, the diminutive Fiat 500 makes the ideal classic for city dwellers. In fact darting around busy city streets is what it has always done best. Pre-1965 cars had suicide doors and never more than 17.5bhp except in the rare 500 Sport. The later 500F and 500L are a better bet, especially if you want to drive any distance, and have conventional front-hinged doors. Last model, the 500R has a detuned 594cc Fiat 126 engine; a point not lost on many Fiat 500 owners, who commonly fit the full strength 126 engine.
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Information from Octane Magazine.