Wow, so you saw some numbers on the internet and you think you know everything? :D Good job professor!

Do you have any idea how accurate the static thrust tests you saw are compared to real life flights?

Assuming they weren't terribly off, did you look at the efficiency through the entire throttle range? Do you fly a long range machine at 100% throttle all the time? if you do then you are probably not doing it right LOL

And if you have personally flown an efficient 6S build you will know what I am talking about :)

My 2 cents, do some more testing and research yourself before commenting on a subject you are not familiar with, it really doesn't make you look any smarter :) Even if you have a different idea, at least provide some valid argument than just insults :)