Audi leaves Austin satisfied with a double rostrum result in the 6 Hours of the Circuit of the Americas but says it still has 'an extreme workload' to catch up to Porsche after once again being consistently outperformed.

The LMP1 squad has suffered heavily since Porsche unlocked the full potential from its hybrid engine, estimated to be up to 4MJ up on the Audi, and after securing reliability it has gone on to claim three consecutive race wins, including the blue riband Le Mans 24 Hours.

The #7 Audi of Marcel Fassler, Benoit Treluyer and Andre Lotterer saw their WEC championship lead trimmed to 10 points by the #17 Porsche after finishing a distant second, while the sister Audi was promoted to the final podium place after the #18 Porsche suffered electronic gremlins late on while leading.

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Ralf Juttner, team director of Audi Sport Team Joest, says the team is happy with its results in Austin but admits they still have a long way to go to catch the Porsches.

"We had an extreme workload - that's how our preparation for the round at Austin began," Juttner said. "Even before, at Neuburg, everyone worked hard for this weekend and during the race week we had very long days at Austin as well.

"Well done to the whole team, I'm happy that both cars achieved a podium result. We were closer on the heels of our competitors than previously at the N?rburgring. Now we're going to leave no stone unturned to defend our advantage in the drivers' standings all the way to the end."

Fassler says the team will return to Germany to continue work on its LMP1 challenger for the next two weeks before packing up and shipping the cars to Japan for the 6 Hours of Fuji, which acts as the sixth round of the 2015 FIA World Endurance Championship.

"I always tried to attack, but the rhythm in traffic on track was never the same," Fassler said. "But that's part of endurance racing too. Obviously, we'd have liked finishing in front of Porsche, but we weren't fast enough for that. We're set on changing that before the next race at Fuji."