Liquefied Petroleum Gas (LPG) is made up from propane and butane, it is far more environmentally friendly than petrol and diesel. LPG vehicles are dual fuel, which means they run on petrol yet can be switched over to the LPG system with no inconvenience. LPG is also nearly 50% cheaper than petrol or diesel, with it becoming more and more popular there is less worry of finding somewhere to fill up.