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The efficiency part only makes sense if you have this information available. Usually when you buy ready converts (like the one you linked) they rarely tell you about the efficiency. When you buy electronic modules (like this https://www.pololu.com/product/2576) you'll get a lot more information ...

Hey, I recently made a hack where I converted my ES2 into fully USB powered version. Is anyone interested in the details? here's a proof: https://twitter.com/asterlabaster/status/933520624483385346 I used https://www.pololu.com/product/2576 flyback, but probably any 5V to 9V should be OK, just pay ...