By simply replacing your engine with a system that runs on thorium, one of the densest materials known to man, you'll only need to a fuel replenishment once a century. How does never having to fill your car with gas again sound? OK, it's not simple at all, but the part about only needing a fill every hundred years is legit. Connecticut's Laser Power Systems has a thorium-powered auto propulsion method in the works. Due to the mineral's density, it can produce a lot of heat, which, with the help of a laser, can turn water to steam and power a mini turbine.
1 gram of thorium can provide more energy than approximately 74 hundred gallons of gas.Prototypes are weighing in at around 500 pounds, making them viable for use in conventional automobiles. Some of the great things about switching from fossil fuels to thorium are that it's plentiful -- there's as much of it in the earth as there is lead - and it's safe. Other than perfecting the system, a big hurdle that needs to be determined is how to best mine it, as there's never been a demand for thorium before.