The one and only reason you can't compare human running and supernatural flying is because when running one has to make a physical effort. When flying, I suppose you are driven by some supernatural energy sourse (e.g. by eating hamburgers ) so your body doesn't have to make physical effort (except for converting supernatural energy to kinetic energy or the like). This is because you don't fly with wings or other physical drive, you are only limited by the power of your supernatural energy source!
BTW, please don't think of me as this really annoying troll that you see all the time on the internet. It has just been ages since I have had the super power debate with someone, and I love discussing stuff like this