When hybrid owners don’t plug in their cars, their vehicles actually wind up using more gasoline than conventional cars, according to Hubertus Troska, Daimler’s chief executive officer for the greater China region. “You’re carrying 150 kilos of electric components with you that add to the fuel consumption,” Troska told reporters in the city of Guangzhou last month. “The effective reduction of emissions will only come if customers actually charge their plug-ins every day.”