Sam Michael: "This laptime was real. Who knows our team, knows that we don't run underweight. Rubens set this time on supersoft tyres. Of course he had carried a little less fuel. The KERS units were onboard. We only cut the connection to the generator and turned off the batteries because we had a problem with the cooling.
Source: automotorundsport.de
Amus.de calculates that Rubens carried 25 Kg of fuel during the run.
According to Michael they have problems with the medium tyre. Soft and Hard work fine.