This one is news to me... a diesel hybrid, 83.1mpg:

http://www.channel4.com/4car/news/ne...?news_id=17097

Here's the kicker:

Quote "The diesel-electric powertrain has been developed specifically with the US market in mind, and California in particular."

Here's some discussion on another forum:

http://forums.tdiclub.com/showthread.php?t=204636