http://hybridexperience.ca

Mostly Prius, but some HCH data as well. Aggregates of hybrid driving from governmental agencies that have purchased the car.

I found a video there starring Andrew Grant, the Vancouver cabbie of some reknown. Leave it to the canucks to have an eloquent cabbie :-)

 

I see they have a little database of their own. Not quite the same sort of system, but it's still a mileage database. Interesting.

[edit]Be careful when looking at some information they provide. I see a lot of graphs that are based off a sample size of just 2 vehicles. That isn't reliable at all.[/edit]

 

Interesting that if you want to contribute data or a comment you have to download a form, fill it out and email it back to them as an attachment.

Too much of a hastle and I don't know about anyone else but I don't download anything from unknown websites, especially from other countries.