I can't see it being faster to sit, *Unless your legs are in much better shape than mine, it definitely works a different set of muscles, because I did 50 miles two weeks ago, no standing and really did not feel fatigued. (13 mph pace) That was on a Saturday, then I did 29 with the club at an 18+ mph pace and felt well worked I stood some on hills to keep up with the pack. Last week I only did 21 fairly hard solo, also stood a little more, and was well fatigued, yesterday I did 41 at a 16+ mph pace. I felt that. But I stood much more too. On several hills I KNOW I definitely was more efficient standing. I left it in the large ring on front, and middle ring on the rear, (9 speed carousel) Sitting I was dropping below 10 mph, standing I was able to maintain 14+ mph on the hills. I probably stood for .25 or more miles at a time 6-8 times. The last three were in the last 5 miles where I was darned fatigued already! LOL