Best source for performance statistics?

[MuZiZZle]

After falling into a debate with someone who was basically quoting stats from fastest laps at me, which look to be generated by use of a dartboard, I was wondering what the best source for actual performance information is.

A quick google of a specific car will ring up varying results every single time, does such a site exist?

Now I understand there's the age of the vehicle, comditions and driver to be factored in, but in schoolboy top trumps terms, what's the most accurate site?

Cheers