Vintage 1980: the GM Lean Machine,

Via magicalpowermako-cosmos:

"The GM Lean Machine was developed by Frank Winchell of General Motors (USA) in the early 1980's as a concept car. The single seater vehicle is a "lean" machine in the true sense of the word as it leans into corners like a motorcycle whilst keeping the stability of a normal car. The original model was powered by a 15 hp 2-cylinder engine that produced a maximum speed of 80 mph with a fuel economy of 80 mpg at 40 mph. Shortly afterwards a second model was produced that was powered by a larger 38 hp engine. With a total body weight of 159kg this gave the vehicle outstanding performance and the Lean Machine was able to reach 60 mph in just 6.8 seconds with a fuel economy of over 200 mpg."

External Link: ThreeWheelers.com