More fuel economy means more factory workers and more production for Toyota's most popular model in Europe. That simple equation explains why the Japanese automaker is boosting annual production of its gas- and hybrid-powered Yaris compact vehicles at its French factory. The new number will be about 222,000, a 15 percent increase. To do that, Toyota will need to add about 500 workers to bring its total there to more than 4,000, UK's The Green Car Website says. Vive le Toyota!