The R10 was competetive not only on long tracks such as La Sarthe.
The car made its debut at the 12 hours of Sebring in 2006, a track with lots of corners and few short straights.
I know that comparing pole position lap times is not the best way to estabilish which car is faster at all, but surely it works better than doing the same by comparing figures written on a paper like "horsepower", "torque" and so on.
So here's a list of poles and fastest lap times set on Sebring (12 hours event), during qualifying sessions, since 1999. Note The track hasn't changed since then.
1999
-Pole Positions
Overall: BMW V12 LMR,
1:49.850, 195.143 km/h
GTS: Chevrolet Corvette C5-R, 2:02.909, 174.405 km/h
-Fastest Laps
Overall: Riley & Scott Mk III Judd,
1:51.608, 192.069 km/h
GTS: Chevrolet Corvette C5-R, 2:05.527, 170.771 km/h
WINNER: BMW V12 LMR
2000
-Pole Positions
Overall: Audi R8,
1:48.825, 196.980 km/h
LM GTS: Chevrolet Corvette C5-R, 1:59.646, 179.165 km/h
-Fastest Laps
Overall: Audi R8,
1:50.286, 194.370 km/h
LM GTS: Dodge Viper GTS-R, 2:01.369, 176.621 km/h
WINNER: Audi R8
2001
-Pole Positions
Overall: Audi R8,
1:49.110, 196.467 km/h
GTS: Saleen S7-R, 2:00.426, 178.005 km/h
-Fastest Laps
Overall: Audi R8,
1:49.666, 195.471 km/h
GTS: Saleen S7-R, 2:01.043, 177.099 km/h
WINNER: Audi R8
2002
-Pole Positions
Overall: Audi R8,
1:48.029, 198.432 km/h
GTS: Chevrolet Corvette C5-R, 1:59.699, 179.086 km/h
-Fastest Laps
Overall: Audi R8, Tom Kristensen,
1:48.418, 197.721 km/h
GTS: Ferrari 550 Maranello, 1:58.607, 180.736 km/h
WINNER: Audi R8
2003
-Pole Positions
Overall: Bentley Speed 8,
1:48.108, 198.287, then assigned to Audi R8,
1:48.826, 196.979 km/h
GTS: Chevrolet Corvette C5-R, 1:59.024, 180.102 km/h
-Fastest Laps
Overall: Bentley Speed 8,
1:49.521, 195.730 km/h
GTS: Ferrari 550 Maranello, 1:59.591, 179.600 km/h
WINNER: Audi R8
2004
-Pole Positions
Overall: Audi R8,
1:48.710, 197.190 km/h
GTS: Chevrolet Corvette C5-R, 1:57.052, 183.137 km/h
-Fastest Laps
Overall: Audi R8,
1:49.443, 195.868 km/h
GTS: Chevrolet Corvette C5-R, 1:57.167, 182.957 km/h
WINNER: Audi R8
2005
-Pole Positions
Overall: Audi R8,
1:49.723, 195.370 km/h
LM GT1: Chevrolet Corvette C6-R, 1:57.347, 182.677 km/h
-Fastest Laps
Overall: Audi R8,
1:48.580, 197.426 km/h
LM GT1: Aston Martin DBR9, 1:56.599, 183.848 km/h
WINNER: Audi R8
2006
-Pole Positions:
Overall: Audi R10 TDI,
1:45.828, 202.560 km/h
LM GT1: Aston Martin DBR9, 1:55.286, 185.942 km/h
-Fastest Laps
Overall: Audi R10 TDI,
1:48.373, 197.803 km/h
LM GT1: Aston Martin DBR9, 1:56.573, 183.889 km/h
WINNER: Audi R10 TDI
2007
-Pole Positions
Overall: Audi R10 TDI,
1:44.974, 204.208 km/h
LM GT1: Chevrolet Corvette C6.R, 1:57.061, 183.122 km/h
-Fastest Laps
Overall: Audi R10 TDI,
1:46.634, 201.028 km/h
LM GT1: Chevrolet Corvette C6.R, 1:57.012, 183.198 km/h
WINNER: Audi R10 TDI
2008
-Pole Positions
Overall: Audi R10 TDI,
1:43.195, 207.728 km/h
LM GT1: Chevrolet Corvette C6.R, 1:56.269, 184.370 km/h
Fastest Laps
-Overall: Peugeot 908 HDi-FAP,
1:44.536, 205.063 km/h
LM GT1: Chevrolet Corvette C6.R, 1:57.087, 183.082 km/h
WINNER: Porsche RS Spyder
2009
-Pole Positions
Overall: Acura ARX-02a,
1:45.278, 203.617 km/h (Audi set 2nd fastest time with its new Audi R15 in 1:45.360 at 203.460 km/h)
LM GT1: Chevrolet Corvette C6.R, 1:57.882, 181.846 km/h
-Fastest Laps
Overall: Peugeot 908 HDi FAP,
1:43.274, 207.568 km/h
LM GT1: Chevrolet Corvette C6.R, 1:56.905, 183.367 km/h
WINNER: Audi R15 TDI
2010
Audi does not take part to the race; end of GT1 class.
-Pole Position
Overall: Peugeot 908 HDI FAP,
1:45.214, 203.741 km/h
-Fastest Lap
Overall: Peugeot 908 HDI FAP,
1:44.972, 204.211 km/h
WINNER: Peugeot 908 HDI FAP
2011
-Pole Position
Overall: Peugeot 908,
1:46.571, 201.147 km/h (2nd time: Audi R15 TDI, 1:47.680, 199.076 km/h)
-Fastest Lap
Overall: Peugeot 908,
1:48.141, 198.228 km/h
WINNER: Peugeot 908 HDi-FAP
Audi R8's best lap time on Sebring: 1:48.029, 198.432 km/h (2002)
Audi R10's best lap time on Sebring: 1:43.195, 207.728 km/h (2008)
that makes almost 5 seconds of difference.
I know rules change, but cars improve too.
Please don't ask me to do the same job for other tracks also cause i've spent almost one hours to write this list!