The General Motors Ultralite was a 1992 low emission vehicle concept car intended to demonstrate the benefits of advanced materials and low fuel consumption. The carbon fiber shell was fabricated by Scaled Composites and it weighed only 420 pounds (191 kg). The total weight of the car was 1,400 pounds (635 kg). The car had gullwing doors and no B-pillar. Its 3 cylinder 1.5 L 2-stroke engine could produce 111 hp (83 kW), which made a speed of 135…