I've been riding for over 50 years with my saddle at the wrong height! I was taught in my youth that the way to measure the height was to sit on the saddle and adjust the height so that the balls of both feet touched the ground. In fact several years ago at not-so-LBS fitting, the height was measured in much the same way. A few days ago I tried the 109% of inseam method and boy does it make a difference to power to the pedals!! I had to raise each saddle by about 4cm. I've now applied this to all my bikes and the tandem and reckon I'm going 1-2mph faster for the same effort as before. With the tandem, I had to lower the saddle a cm or so from the 109%, as I still can't master mounting by pushing off and then climbing onto the saddle. Just thought this might be of interest. See
for more info.