They only recently got around to adding electric wheels to airplanes[1], which may save up to 1.1 billion dollars annually since using jet engines to move a few mph is like, zero efficient.
Wow, that is a great idea. I mean, propelling a vehicle at 5 mph using jet engines optimized for 600 mph has to be one of the most energy inefficient means ever invented.
[1]: http://gizmodo.com/these-little-electric-wheels-will-save-ai...