In order to conserve fuel, drivers can use a “pulse-and-glide” driving technique, accelerating and decelerating an automobile in cycles of approximately 10-30 seconds. While this technique can be an effective way to improve fuel economy, it requires sustained attention from the driver. Innovators at NASA’s Glenn Research Center have automated the pulse-and-glide technique using a flywheel energy storage system. The pulse-and-glide flywheel presents an economical, reliable, and long-term solution to dramatically improve the gas mileage performance of internal combustion engines (ICEs). Unlike chemical batteries, which have a short life span and high replacement costs, flywheels provide the power and energy requirements necessary for a pulse- and-glide technique.