Idea of Fuel Efficient Car and Solar Cars

I had a great idea for a fuel efficient car and to help lower obesity...we could add pedals to all cars and people could use them and recharge the cars. That way the people would lose weight and the cars would get more energy. Just an idea. But just in case this isn't a legitimate blog...Solar cars depend on PV cells to convert sunlight into electricity. In fact, 51% of sunlight actually enters the Earth's atmosphere. Unlike solar thermal energy which converts solar energy to heat for either household purposes, industrial purposes or to be converted to electricity, PV cells directly convert sunlight into electricity. When sunlight (photons) strike PV cells, they excite electrons and allow them to flow, creating an electrical current. PV cells are made of semiconductor materials such as silicon and alloys of indium, gallium and nitrogen. Silicon is the most common material used and has an efficiency rate of 15-20%.