The overall shape of the XF does not shout Jaguar, but the familiar design cues are everywhere. Within each new-age headlight cluster sit two round, sealed beams that maintain the brand's quad-lamp signature, complete with the traditional fluting above the lights. The chrome trim above the side windows comes straight off the historic Mk. II sedan, while the prominent hood bulge recalls the E-type, which is arguably the most famous Jaguar of all. We're not enamored with all the jewelry, however. The bright metal strip on the trunk lid looks ordinary, and the leaping Jaguar in back is overkill.
The XF's basic shape does more than create a high-impact presence. Aerodynamically, it's the most efficient Jaguar sedan ever, with an impressive 0.29 drag coefficient and a front-to-rear lift balance of zero. That means that neither end of the car is more inclined than the other to lift in the airflow as speeds increase. The excellent aerodynamics help keep the XF stable at high speeds, reduce wind noise inside and reduce fuel consumption at a given speed, compared to a car with more drag.
The XF is slightly larger in just about every exterior dimension than the Audi A6, which was previously the largest car in this class. Its underlying structural design is driven by safety considerations, and particularly by the goal of protecting against side impacts and the tendency of tall, sport-utility type vehicles to slide upward in collisions with sedans. Jaguar has applied a host of high-tech metals, including high-carbon steels, dual-phase steel, hot-formed boron and bake-hardened steels, to create a vertical safety ring around the XF's occupant cell. The company claims that the XF will deliver the best crash protection in the class with a body/frame package that is lighter than that of its competitors.
There's a second benefit to this careful structural engineering. While the XF's body is larger, Jaguar also claims that it is the most torsionally rigid car in the class, meaning that it flexes less from end to end under pressure. This overall stiffness and rigidity is one of the factors that separate luxury sedans from less expensive, higher-volume models. It's the foundation for minimizing noise and vibration inside an automobile, and the well from which dynamic capabilities such as handling, ride quality and overall responsiveness flow. Next Page