I built a 3ds Max model of the Dymaxion Car years back and have revived it in some renders here.

 

Some Background information. The Dymaxion Car was a teardrop-shaped (least air resistance), 3-wheeled, rear-wheel (single) steering, 20 foot long, Aluminum bodied auto, designed by Buckminster Fuller in 1933 to achieve maximum output and service with minimum material input.  It was about 6 feet tall (kind of like a big van), seated the driver and 10 passengers, weighed around 1600 lbs., went 120 miles/hr on a 90 horsepower engine, and got as much as 30 miles to the gallon of gas.  Fuller referred to it as the "Dymaxion Car", "Dymaxion Vehicle", and "Omni-Medium Transport" since it was ultimately intended to go by land, water, or sky.  Only three were ever built. Until Lord Foster built No.4 in 2011- fantastic!