Diesel motorbike

[armb]

http://www.startwin.com/ appears to say 2,5l/100km, which is about 113 miles/gallon, with potential for more from a less sporty version.
http://www.treehugger.com/files/2005/06/biodiesel_motor.php (mpg figures in comments will be American gallons).
http://thekneeslider.com/archives/2005/02/25/thunder-star-1200-diesel-by-star-twin/