Video: Porsche 919 and Audi R18 LMP1 Cars at Sebring

The new Porsche 919 Hybrid LMP1 and Audi R18 e-tron Quattro diesel hybrid testing at Sebring International Raceway along with the Porsche 911 RSR, P2 cars from Delta/Millennium Racing, Greaves, and Oak, and 2 VLN/ADAC series BMW's.