An interesting application is the use of nanoparticles which are added to diesel fuel for vehicles. The nanoparticles help the fuel burn better in the engine and the result is that you get more miles per gallon, and, because the fuel is burning more efficiently, there is less effluent coming out of the exhaust pipe. In addition the engine does not need servicing as often because the engine stays cleaner.
Nanomaterials are also increasingly being used to make cars lighter and stronger, so using less fuel and fewer metals