The Jetta is the German brand's best-selling model in the U.S., and carried the water in the market before VW made a big move into crossovers this year with the three-row Atlas and redesigned 2018 Tiguan. Now, Volkswagen believes that much-improved driving dynamics, more technology and a more fuel-efficient gasoline powertrain in a redesigned Jetta that is moving onto the brand's global MQB platform will draw sedan customers into its showrooms.