i have a feeling the audis were on race setup. Or at least sand baging. The pescis wont be able to keep up, the only petrol car with the pace to beat the diesels at all is the lola aston martin.
Gap will be much closer obviously when Peugeot was on "lets make some nice headlines" mode but it's still simply faster, like it was in Sebring and like it was in every three 1000km Le Mans Series races this year...