Okay, this image was posted by member "psdrei" in reply to my specualted 918 Spyder 'ring time of 7:26. I said this because the Porsche's claimed Carrera GT 'ring time was 7:32, and it's actual 'ring time was 7:28, 4 seconds faster. When Porsche told us the 918 Spyder did it in 7:30, it was only a simulated time. So, member "psdrei" uncovered a document from Ferdinand Piëch, claiming that the 918 Spyder Concept ACTUALLY does the 'ring (non simulated) in 7:20!
That's 8 seconds faster than the production Carrera GT, and this is just a concept car!
I'm not 100% sure how reliable the source image is, so correct me if I'm wrong on anything. It's still pretty interesting.