I'm certainly not interested in a fixed-gear bike, although I can see the perception of more efficiency in that system, as mentioned above. It sounds like converting to a SS probably isn't worth it based on what I've learned here and I would be better off just riding in one gear on my multi-speed bike. The "idea" of a simplistic drive-train that makes the bike more streamlined is still appealing to me but I would have to expect a significant, real difference in how the bike feels to justify conversion.

Thanks!