Everyone is taught not to use mobile phone at petrol station because it causes fire. But Dr Adam Burgess, of the University of Kent, say that out of 243 petrol station fires attributed to mobiles around the world in the last 11 years, not one was caused by a handset.

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There are also some related website relates to using mobile phone at petrol station

http://www.ericsson.com/about/health/files/MMF/MMF_Viewpoint_PetrolStations.pdf

Report from Motorola

In short, Motorola can report that: 

• There has been no documented incident anywhere in the world where the use of a mobile phone or portable radio was found to cause of a fire or explosion in a gasoline station.
• There is no credible reason, based on technical evaluation, to believe that the use of these products poses any such hazard.

http://www.motorola.com/mot/doc/0/203_MotDoc.pdf

Australian Mobile Telecommunications Association - It's a myth
http://www.amta.org.au/default.asp?Page=237

It's a hoax
http://www.hintsandthings.co.uk/garage/phonehoax.htm

Some substance to it
http://urbanlegends.about.com/library/weekly/aa062399.htm

They tested it on TV
http://lazylaces.com/article.asp?p=641

A technical look
http://www.peterharris.org.uk/roadsafety/mobilesandpetrol.htm