Transit Ads

What kind of advertising would you like to see on the bus? I think it would be great for energy companies to place ads that inform people who take public transit other ways to lower their cost of living. It would help keep energy costs in their consumer's minds, and help them save money too. Especially when many of the people who take the bus, take it daily.  It will help people think that they are supporting a green way to save money ,and help the environment.