The Mariner benefits from a powertrain upgrade. A new 2.5L four-cylinder with variable cam timing adds 17-bhp. The 2.5L is ULEV II certified. The same 2.5L four-cylinder also serves as the basis for hybrid models. The 3.0L V6 receives a power bump to 230-bhp. A six-speed automatic is offered for the first time. Several changes including a revised lower front fascia and new tires improve aerodynamics and reduce rolling resistance, thus improving fuel efficiency. The Mariner also switches to Ford's capless fuel-filling solution.