I agree with the advice in the previous posts. I switched in June, and have done 5 AG batches. I started with a couple of pre-crushed kits, and was getting mid-60s for efficiency. I then started crushing my own. The first crush was low, because I wasn't crushing enough. The last two have been 70%+, and that seems to be the ballpark most people talk about, unless you're just determined to chase the numbers. Not for me, I intend to work on refining the beer, not the statistics.