Believe it or not, but a bunch of mechanical engineering students at California Polytechnic State University have created a three-wheeled car called the “Black Widow” that boasts an extraordinary mileage of 2752.3 MPG, and that too without using batteries. Developed for the upcoming Shell Eco-Marathon student competition, the wonder car generates power from a customized 3 horsepower Honda 50cc four-stroke engine to reach a top speed of 30 MPH. in addition, the super-efficient vehicle has a drag coefficient of 0.12 and weighs just 96 pounds.