If I might hijack the thread briefly, I have a general MTB pedal vs. road pedal question that is somewhat related to this thread.

Like many, I've standardized on SPD and MTB shoes (M540 and Sidi Dominator) for road riding for many many years as I like the recessed cleats, double-sided pedals, and ease of getting in/out. I also like not having to think about different shoes depending on what bike I'm riding as I have a couple mountain bikes and a hybrid I occasionally ride. I'm happy overall and like SPD. But I have a big, week-long supported tour coming up this summer with 80+ mile days of all road riding. Is the efficiency advantage of pure road pedals/shoes enough that I should consider going SPD-SL with road pedals for this ride? I haven't used pure road pedals since the 80's when I had one of the original Look setups.

- Mark