Audi's new suspension turns rough roads into electricity and saves fuel

Carmakers have already figured out how to capture the energy lost to slowing a car. It's called regenerative braking.

Rather than slow a vehicle with conventional friction brakes that turn forward momentum into heat, hybrid and EVs spin their electric motors in reverse. This both slows the car and generates electricity, which later can be used to power the vehicle.

Turns out, there's still more energy to be captured that is currently going to waste in modern automobiles: the kinetic energy generated by the movement of the car's suspension.