I heard some HCH needed an IMA upgrade since it sounds like your battery is not charging at all. that it helps to check your 12 volt. You have an awesome car, don't give in yet.

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 195,000 km to date.