You can get a good sense of this by seeing the distribution of “most marked” Kindle passages within the book itself. For the winner, Donna Tartt’s The Goldfinch, “all five top highlights come from the final 20 pages.” That suggests many readers actually finished the book (as did I, though I found it forgettable). So that wins the prize as the most read bestseller this year, although it does not seem every single bestseller was sampled. Not so well read are Kahneman’s Thinking Fast and Slow, Stephen Hawking’s A Brief History of Time, and coming in last (first?) overall is a book which has been covered rather frequently on MR as of late, can you guess the name?, 700 pp. or so and “the last of the top five popular highlights appears on page 26.”
The full article, by Jordan Ellenberg, is here.