There are several obvious ways to improve fuel-efficiency, but improved aerodynamics is probably the easiest and most cost-effective.

ECONOMIST: Fuel economy

The rear end is very tightly packaged with bodywork tucked in around the engine and gearbox for improved aerodynamics.

BBC: Radical new McLaren breaks cover

In the interest of improved aerodynamics and noise reduction, the front of the vehicle has been rounded and softened, ineffably feminized compared with the previous model's teeth-baring front end.

WSJ: 2013 Range Rover Review: If You Must Buy a Luxury SUV... | Rumble Seat