12% of e-book readers have borrowed an e-book from a library. Those who use libraries are pretty heavy readers, but most are not aware they can borrow e-books.
Download the full survey here: PIP_Libraries_and_Ebook_Patrons 6.22.12
Source: Dec. 2011 results are from a survey of 2,986 people ages 16 and older conducted November 16- December 21, 2011. N for print book readers in the past 12 months= 2,295. N for e-reader owners in the past 12 months=793. N for audiobook listeners in the past 12 months=415. The survey was conducted in English and Spanish and on landline and cell phones.