I do not believe the 40:24 mentioned is humanly possible, with fresh legs. With tired legs certainly not. Ha! What would a fresh Schleck have done, 39 minutes.
I still stand by Sorensen's FTP of 5.8 watts per kilo measured using his SRM power meter spot on accuracy, no arguments.....Evans, Andy, "contadope" all are over 6 watts per kilo FOR SURE due to that power data from the handy Sorensen.
They are blood doped but not as much as the olden days perhaps.....Maybe their only at 50% crits.....But that still gives a big "boost" especially if your undoped crit is 41%......
At some point their will be a new way to dope in cycling....possibly by modifying genetics......
Doping wont ever ever end, dont kid yourselves, instead learn to live with it and ride your bike for the satisfaction aerobic sports give you.