My first impulse, given the loads of data to the contrary, was to just hit that down arrow and move on. But that's not fair, so I'll instead throw out: "got a citation for that?"
Here are 2 dudes that did a trial, they produced more watts going up hill in flats, sprints were a big difference though. These were people used to being clipped in, and not using flats.
Where's the studies to the contrary? Nothing I've seen has been more than marginal at best.
