Students from West Philadelphia High School have built a diesel-hybrid race car that goes from 0-60 in four seconds. While the car currently gets 60+ mpg, they hope to soon break 100 mpg.
Why? They are competing for $10 million in the Automotive X-Prize. [Details] By the way, the chassis is a K1 Attack Kit car which can be purchased online for roughtly 20k. The talent is in the choice of parts that they put in it and the modifications required to fit everything. These kids didn't actually design this car from the ground up. The kit comes with the chassis and the body and most of the hardware from the factory. Still impressive though.