Thorium@Large

If your car was powered by thorium, you would never need to refuel it. The vehicle would burn out long before the chemical did. The thorium would last so long, in fact, it would probably outlive you.

this-car-runs-for-100-years-without-refuelling-the-thorium-car

Thorium is one of the most dense materials on the planet. A small sample of it packs 20 million times more energy than a similarly-sized sample of coal, making it an ideal energy source.

Source – collectiveconsciousnes.net