Oreca is running a slightly different aero. The small gurney on the rear fender is missing. Compare
http://www.endurance-info.com/versio...Libres2_19.jpg with
http://www.endurance-info.com/versio...Libres2_20.jpg Not sure if that makes a real difference.
Perhaps Davidson just had less traffic. In section 1 the Peugeots were only .3 sec apart.