I've been experiencing consistently high attenuation using US-05 in various pale ales and IPAs. For example recent recipe used approx 50/50 2-row/vienna, with 4% rye malt and 8% crystal. OG was 1.060 and FG was 1.008. I'm quite confident in my gravity readings (taken with refractometer only for FG, refract and hydrometer both for OG).
I mashed a bit lower than planned for this batch, 150, in a cooler, measured with a cole-parmer thermocouple.
I'm experiencing 80% + attenuation on previous batches as well.
Not that this is a bad thing, just curious about why.