Audi believe that they would have beaten the LMP2 Porsches for the first time since the second round of the season if they weren't running smaller fuel tanks.
The LMP1 Audi R10s have been unable to fight with the lighter LMP2 cars on most of the American circuits this year, but at Mid-Ohio last weekend Emanuele Pirro and Marco Werner led 67 of the 134 laps.
However, due to the smaller fuel tanks that diesel cars have to run, the Audis had to put more fuel in each time, while the cars with bigger tanks were able to take on less fuel later in the race.
"We lost the race in the pits," said Werner. "At the second stop we simply lost too much time during refuelling. That's how the regulations are."
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