Japanese scientists have taken a standard gas-powered car (the legendary Mazda MX-5 in this case) and converted it to rely purely on solar power to run. This was made possible by the Total Mobility Project, as the team removed the MX-5's engine and gas tank in lieu of an electric motor and battery. Seven solar panels were also installed across the hood of the car, and this setup enabled the vehicle to run at a top speed of 100km/h with a maximum range of 30km. Conversion will hit your pocket hard though, as the entire process will cost $21,000 but for drivers who run an average of 60km a day can save up to $8,400 across the time span of five years. Guess it will take a good 15 years or so before you can start counting your ROI, which by then the car would've probably be sent to the junkyard.