Tesla, Inc.‘s (NASDAQ:TSLA) rivals in the Chinese electric-vehicle market reported monthly sales numbers for August, which showed flattish to slightly higher performance versus a strong July. What Happened: Of the U.S.-listed trio, XPeng, Inc. (NYSE:XPEV) outperformed with both year-over-year and quarter-over-quarter increases in August. Warren Buffett-backed BYD Co. Ltd. (OTC:BYDDY) (OTC:BYDDF) also showed modest month-over-month growth, although its plug-in-hybrids did better than pure battery EVs. Shanghai-based Nio, Inc. (NYSE:NIO) and Beijing-based Li Auto, Inc. (NASDAQ:LI) could not matc…