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I use p & g all the time mountain biking. The catch is I ride a single speed and when I begin to spin out, I can run my cadence up to 132-134 rpm or so but can't maintain it for very long. So I end up spinning the bike up for 5-7 sec, then coast down for 5-7 sec, then power back on and repeat. Works well and I can maintain a higher average speed then if I put forth a sustained effort. I don't know if it's more efficient because at a high cadence you're running into the physiological and mechanical limitations of your body and all sorts of secondary movement begins happening (ie bouncing around on the seat).
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