The Chron lost 7 percent of its daily circulation to 339,430 copies compared to last year while Sunday was down a hair more, 7.4 percent to 398,116, according to the latest figures from the Audit Bureau of Circulations as reported by E&P. The Mercury News was down slightly, 1.9 percent to 224,199 and Sunday was down 4.3 percent to 241,518.