How much gears does a one cylinder car have?

Because the number of gears in the transmission has NOTHING to do with the number of cylinders in the engine, there is no way to answer this completely. However, since a one cylinder motor is only possible with a 2 stroke and a HUGE centrifuge, there would be no way to have multiple gears in a one cylinder engine. It would have to be a generator of some sort with a single ratio clutch system, like one could find in a lawn mower type engine.