I am impressed with the effort that has gone into the mileage database. As far as improvement, the one thing that seems to interest a lot of people is discussing the various technical aspects of each of the various hybrid systems. There are often posts that have excellent discussions and/or informative links, but as they age they often drift away into the historical back pages. Sticky posts are ok, but too many just get annoying for daily chatter (I've seen other forums where most of the 1st page is old sticky posts). I'm wondering if each car, or maybe each hybrid system, could get a "Technical References" hall of fame type listing that would allow people to easily refer to the best technical reference postings made. Probably would take a lot of administrative work to maintain and ensure the quality of such a listing though, but I think having such a listing would be an excellent one stop starting point for newcomers to help them understand how what they have works.

Two climate control systems, one inside and the other at the tailpipe.

2007 Camry Hybrid (in service June 2006)
FE: 6.77L/100km (34.8 mpg) over 37750km (23450mi)
75% city - Ave trip 20 min - 2 Winters