I could see them wanting to tax gas guzzlers to deter people from buying low mpg cars, but singling out Porsche is ridiculous. What about all the SUV, Lambo's (9mpg), and other cars that get even worst milage than most Porsche's. It's crazy to think that Porsche is solely responsible for all of the gas guzzlers in London.
Personally, if I was the mayor, I wouldn't face off against a billion dollar company, like Porsche.