Recuperating power: Charging a prototype Audi e-tron with kinetic energy

Enlarge / A full side view of Audi’s prototype e-tron SUV. (credit: Megan Geuss) COLORADO SPRINGS, Colo.—Last week, Audi invited a handful of journalists to go for a drive down Pike’s Peak, one of Colorado’s many mountain tops that rise more than 14,000 feet above sea level. We rose before dawn and shuttled up the […]