To be fair, the study's authors have made it clear in the study's pdf that it was commissioned on Microsoft's request and other requests that MS made and how th

To be fair, the study's authors have made it clear in the study's pdf that it was commissioned on Microsoft's request and other requests that MS made and how the test beds were running. It looks fairly neutral and can be replicated. They do not make recommendations or conclusions for MS, it is MS that interprets study's results. If looked at power draw, the difference between browsers is small, but IE has an advantage albeit small. Also, the study was done by Kurt Roth of MIT-Fraunhofer Center for Sustainable Energy and looking at the pdf, it shows.