Fastest lap of the 'ring for a standard production car is 6.55 which Michael Vergers set in the Radical SR8
Motocyclist (90's) compared a Yamaha litrebike against a Z06 - bike wins
Motorcyclist (recent) compared a GSX-R 1000 against a Z06 - bike wins
Evo compared a sportbike (forget) against a bunch of cars (M3, Lambo Murc, etc.) - bike wins
Clarkson vid compared an R1 against a 911 C4 - car wins (suspiciously )
Fifth Gear ran 3 tests, I think the bike won 1/3
these were on a track???
On the Nordschleife I go faster than 95% of the bikers with a MINI!! and I am neither particularly skilled nor particularly brave...
From what I've read, the drag coefficient for a bike is worse than almost anything else on the road (van, truck, etc.).