Shell announces a new, cleansing gasoline

[auto123.com]

By adding nitrogen as an additive, Shell is planning on offering North American consumers the cleanest gas available on the continent to date. The announcement, made during a press conference, also responds to the demands of certain performance car manufacturers that are calling for cleaner and cleaner gasolines to facilitate the development of new technologies.
[full story]

[isit90u]

Sounds puzzling. Is the nitrogen a gas which will evaporate while refueling. Or, is it liquid, which will have to kept soooo cold. Either way, I think it's a marketing ploy to boost sales for Shell. BTW, Shell gas gives me the worst milage.