Volkswagen AG (VOWG_p.DE) said a scandal over falsified U.S. vehicle emission tests could affect 11 million of its cars around the globe as investigations of its diesel models multiplied, heaping fresh pressure on CEO Martin Winterkorn. It also warned that amount could rise, saying diesel cars with so-called Type EA 189 engines built into Volkswagen models worldwide had shown a “noticeable deviation” in emission levels between testing and road use. The U.S. Environmental Protection Agency (EPA) said on Friday Volkswagen could face penalties of up to $18 billion for cheating emissions tests.