The fat outer tire can be moved in and out on the axle before the race to achieve maximum cornering power for track conditions.

FORBES: Vroom!

Expect future cars to help motorists garner maximum mileage by leveraging technology like the eco-tutoring systems found in many hybrids, wider use of tire-pressure, oil life and engine-tuning monitoring systems and more-sophisticated GPS guidance that can select less-congested routes.

FORBES: How To Turn A Fuel-Efficient Car Into A Gas-Guzzler (And Vice-Versa)