[vertex-four]

Here in the UK, most cities have at least some form of much-marketed hybrid bus. I'm not sure how much they save, but obviously there's an incentive to at least try it out.

[lobster_johnson]

NYC, under Bloomberg, invested grandly in hybrid buses, but after several years the MTA decided to go back to diesel, blaming lack of reliability:

http://www.ibtimes.com/new-york-city-scrapping-nearly-fourth...