2016 Mazda Mazda6 I Grand Touring Review. The 2016 Mazda Mazda 6 is a mid-size sedan capable of 40 mpg on the highway. The Mazda6 is powered by a SkyActiv gasoline engine producing 184 horsepower and 185 lb-ft of torque, routed through a 6 speed automatic transmission to the front tires.