Derringer Cycles
Motorized bicycles have always been one of the the... ...cross between a Ducati and a Schwinn. Behold, the Derringer Cycles: Derringers can be pedaled as a traditional bicycle, propelle... ...of fuel economy ratings that can exceed 150 mpg, Derringers are the first product to...
https://www.neatorama.com/2009/03/22/derringer-cycles/
