here 's an article to help you squeeze more juice from your HCHII

http://www.cleanmpg.com/forums/showthread.php?t=1306

i got around 20 km a liter when i drove a civic 5 spd using advanced hypermiler techniques
and now I drive a salvage nwh20 prius that gets almost to 25 km/l with 192,000 km to date.