I was surprised when I got 79% apparent attenuation on my most recent batch (English Pale) with WLP002 yeast. The beer was mashed at 150F. It was pretty cold out on that brew day (mash tun was cold from being stored in garage) and the mash temp settled a couple of degrees lower than planned, but, I figured 150F was fine and therefore left it alone rather than trying to increase the temp.
For what it's worth, the beer is off the hook good, so, all's well that ends well.