We told you last week in our first experimental post that BookStat.com showed online pre-orders for AMERICAN DIRT of 9,190 hardcovers; 10,436 ebooks; and 3,088 audiobooks. From publication day through Saturday June 25, to align with bestseller lists, BookStat shows online sales of another 8,913 copies, ebook sales of 10,971 units, and digital audio sales…