[aerohead]

The July 2013 MOTOR TREND had an article about Volkswagen's Bugatti Veyron Grand Vitesse which included some aero tidbits:
*in top-speed mode,the car configures itself for less downforce (lower drag ) to protect the tires from self-destructing beyond 233-mph.
*flaps at the front of the tunneled diffuser close,forcing the air to take a flat pathway under the diffuser's belly.
*the rear spoiler tucks in tight into the body.
*DROPS THE CAR LOWER TO-AND LEVEL WITH-THE ROAD.
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In 'Handling-Mode',the rear spoiler creates as much as 770-pounds of downforce (also acts as an airbrake).
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So,in light of the PROBE's inclined belly,Volkswagen (current King of production car fuel economy) takes a different tack.
PS,the Veyron,at top speed,consumes it's entire 26.4-gallon tank of fuel in 8-minutes,covering 35.73 miles until fuel starvation.Range anxiety?