Ive noticed that Zwifts efficiency factor is a bit of a mystical concept, with some people swearing by its accuracy and others calling it a joke. So, Ill ask the question thats probably going to get some of you upset: whats the point of even paying attention to Zwifts efficiency factor if its not actually reflecting real-world efficiency? I mean, lets be real, how many of you are actually getting aerodynamic testing done to validate your Zwift numbers? And if youre not, then whats the justification for obsessing over a number that might not even translate to real-world performance gains? Is it just a case of numbers dont lie or is there actual science backing this up?