Liquefied petroleum gas (LPG), otherwise known as propane, is arguably one of the longest-established – but now sometimes forgotten – alternative fuels. It was traditionally often thought of as almost a waste by-product coming from oil refineries. In North America, however, it shows signs of making a comeback, despite the falling price of regular automotive fuels, namely gasoline and diesel.
The revival of interest in LPG, mainly on the West Coast of the USA, has come about as the result of
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