Regenerative brakes in many hybrid cars such as the Toyota Prius are designed to store the vehicle’s kinetic energy in the battery for later use in acceleration. Such brakes currently can absorb roughly 50% of the kinetic energy lost through braking. Most cars get better gas mileage in highway driving than city driving, but the Prius gets better gas mileage in city driving (51 mpg city versus 48 mpg highway for the 2012 model). Can regenerative braking explain this? If so, how? Give a quantitative explanation for your answer.