Just got my ESB into the fermentor about 10 min ago. Overshot my gravity a little, though-this is the second brew in a row that I've hit 88% efficiency on the nose (I'm gonna have to adjust my recipes for the higher eff). I've mentioned it before on other threads but two things I've done in the last few months have profoundly effected my efficiency:
First, I started ordering from Brewmaster's Warehouse and my efficiency, which had been parked at around 71% since I started all grain, jumped to 80%. Their grind is great!
Second, for the last two brews I've dropped my ph a touch and have gotten another 8%.
Love it.