The Audi RS e-tron GT makes a bargain with physics: more power, less range. Its output reaches 636 horsepower in boost mode, putting it above the e-tron GT quattro, while its low, wide body stays close to the concept that previewed the production car. The styling promises speed; the energy bill follows.Regenerative braking softens that bill, but cannot erase it. When the car slows, its electric mo...More