That would be awesome! Feel free to contact me privately. www.spritmonitor.de seems like quite a nice site. There's also a Finnish site http://tankkaus.com/ with a similar idea but it seems to be only in Finnish.
Thanks. I've always been a little unsure about some of the English terms used. Actually my dictionary would use 'make of car'. Wikipedia also has an article List of car makes. Is it different in the UK and US English?