I am surprised that I have not been able to find any actual data on the efficiency of single speed vs geared. I generally ride road geared, but occasionally train with SS. I have a geared bike and a SS bike set up very similarly. My intent is to ride them alternating laps over a 7.5 mile course near my home. I will also have some laps with the geared bike in one gear the same ratio as the SS. I realize the results will be somewhat specific to me, the course, etc., but I will find them interesting.

I see lots of speculation but no data. If any one has or knows of actual data, please let me know.
Thanks, Steeltrap21