There's also a difference between low cadence standing and higher cadence standing. Once you train it enough, you should be able to stand and pedal at a relatively high cadence without going anaerobic which I find has increased my speeds without sacrificing too much efficiency compared to sitting, but low rpm standing tends to be the least efficient IME and takes to you into the red much faster.
Originally Posted by
Voodoo76
Agree. And you tend to see that skill in smaller/lighter riders for some reason.
you can also turn it around and use a slower cadence and slower speed while standing to rest a bit. I'm smaller and if i had my choice i'd be standing on every hill but there is a length limit for that.