 Complete the following phrase:  The lead Audi and Peugeot pack were never far apart. It appeared that while the Audi R18 could not run as far as the Peugeot on a tank of fuel, its tyres could last 4 stints, while the 908s could only last 3, a direct result of the low-drag design. All 4 cars were leapfrogging each other pitstop after pitstop. Calculations for the pitstop cycles indicated the advantage to Peugeot car 7, but this was negated when Alexander Wurz collided with the barriers at Indianapolis, dropping the 7 back 3 laps. After a close battle in the last few hours of the race, the fate of the race came down to the final pit stops. Andre Lotterer in the 2 R18 had a large enough lead that he was able to pit without losing track position to the Peugeots. The Audi had a 40-second lead after its penultimate pit stop, but started to develop a slow puncture. At what should have been the last pit stop for fuel, Audi was forced to change tyres as well, while Peugeot brought Simon Pagenauds 9 car in for just fuel. The Audi 2 stop was longer but Lotterer nevertheless left the pit lane just seconds ahead of the Pagenauds Peugeot. On fresh tyres, Lotterer was able to pull away gradually and crossed the finish line just 13.854 seconds ahead of Pagenaud. The final lap was the first full race speed final lap as opposed to the traditional staged photo-finish since that of the 