[mamelukesabre]

Ahh, but us diesel affictionados have an angle to coerce them...bio-diesel.

40+MPG??

Oh no! You are behind the times mister. Check out Volkswagen’s bluemotion line of vehicles.

http://en.wikipedia.org/wiki/BlueMotion

[mamelukesabre]

And then there is the new special edition of the VW lupo 3cylinder turbo diesel...called the Lupo 3L.

http://en.wikipedia.org/wiki/Volkswagen_Lupo

I’ll not spoil the suspense so I’ll let you find the MPG figure for it.

Here’s a related article about a motorcycle built with the lupo engine...

http://thekneeslider.com/archives/2005/02/25/thunder-star-1200-diesel-by-star-twin/

Here’s an animation of something really really interesting:
http://www.jjsdesign.net/jj2s/video/jj2s05.avi
http://users.breathe.com/prhooper/opads.htm
http://www.jjsdesign.net/jj2s/patent.html
The second two aren’t animations, just some sketches. But seeing how you’re interested in engine technology, I threw them in for your viewing pleasure.

This one is in polish, but you can still fumble around the site and look at the pics.
http://www.jjsdesign.net/