Liquefied Petroleum Gas and Compressed Natural Gas - petrol alternatives
Pros: Any car can be made to run on these fuels with modification. Can be supplied through existing fuel infrastructure. Real reduction in CO2 emissions.
Cons: Conversion is involved and costly.
Fossil derived fuels, but as they are purer than petrol/diesel, they tend to give lower emissions. As a general rule, LPG is better suited to petrol engines and CNG for converted diesel engines. LPG has become more popular in the UK - CNG is hard to find and has no real distribution infrastructure - and motorists have found it worthwhile to convert their cars to run LPG (usually in a dual fuel set up) thanks to considerably lower duties meaning a low pump price, while seeing almost identical MPG as petrol.
CNG powered cars have found more of a market in mainland Europe, where vehicles so equipped can show up to a 20 per cent reduction in CO2 emissions.
