Originally Posted by
Fat Boy
I will say that if I'm going along a straight road, shift (up or down) and gain speed without a difference in perceived exertion, it's *maybe* more efficient?
Sorry, going faster at the same perceived exertion (or power for that matter) is not a measure of efficiency. Efficiency is the work produced divided by the energy consumed. For cycling, it can only be measured with a power meter and a gas analyzer. There's no way to "feel" efficiency.