Think Fred Flintstone's foot-mobile -- with a 21st century twist. It's the ELF bike, which combines pedal and solar power in a futuristic shape. Mark Stewart is driving and pedaling his ELF from the factory in North Carolina to his home in Cambridge, Massachusetts. He started July 15 and figures it will take about a month. He covered the first leg, to northern Virginia in about five days. The car-bike hybrid can do about 30 miles per hour on combined pedal and electric power. It goes about 20 on electric alone. The ELF starts at five-grand. But forget it’s performance, it’s a cute ride!