The entire fleet of buses in Delhi were converted to CNG from diesel. In reference to this, which one of the following statements is false?

CNG buses use a different engine compared to diesel buses.
Under the direction of the Supreme Court the government switched the entire fleet of public transport buses from diesel to compressed natural gas (CNG) by the end of 2002 because:
· CNG burns most efficiently, unlike petrol or diesel, in the automobiles.
· CNG is very efficient and very little of is left unburnt.
· CNG is cheaper than petrol or diesel.
CNG cannot be siphoned off by thieves and adulterated like petrol or diesel.