Diesel bus drivers
CNG can't be siphoned off like diesel. According to G S Cheema, former managing director of Delhi Transport Corporation (DTC), at least Rs 50,000 worth of diesel per DTC bus is siphoned off every year.

Diesel refineries, transporters and retailers
All along the supply chain huge amounts of money are made by adulterating diesel. Retailers have repeatedly argued that the commission given to them by oil companies is very small. All kinds of waste products and solvents from oil refineries, as well as kerosene, get bunged into diesel.

Oil company officials and petroleum babus and netas
Huge amounts of diesel are imported every year - worth Rs 5,000 crore in 1998-99, for instance. Industry folklore says that huge commissions, running into crores, are made when there are spot purchases. Growing use of CNG in public transport will reduce spot purchases of diesel.

NOTE:
Bus transporters are another lot who are against the conversion to CNG. They just want to ply their diesel buses. Says a former chief secretary of the Delhi government, "After the redline and blueline buses were introduced, everybody in Delhi entered the transport business with a bus or two. Numerous police personnel and clerks in the government operate buses as benami owners. No politician can afford to ignore them. They are a very powerful lobby." Is it surprising then that even though five people die on Delhi's roads everyday, buses being a major killer, the Delhi police rarely catches one?