well not all cars have 'Ring times, but there's a topic here on JW with all the Sport Auto Supertest results, and that also includes a 'Ring lap time which is as reliable as any, cos its always with the same driver. just use the Search button
im not sure hte F1 has a 'Ring lap time, im pretty sure the koenigsegg and the Veyron both do not have one (yet?)
[EDIT] just to stimulate your laziness even more, here's the list