Originally Posted by cyccommute

Citation? "I saw as study" doesn't cut it.



I don't think that paper says what you think it says. Yes, during submaximal efforts, there is little difference. The money quote



(The whole paper can be found here)

There are numerous opportunities where a touring cyclist might need to use "maximal" effort. We may not sprint to a finish line but climbing hills on a loaded touring bike is solidly in the category of "maximal" effort and a place where having your foot solidly attached to the pedal is advantageous.