The B5 powertrain is a fuel-efficient mild-hybrid powertrain. It consists of a 2.0-liter four-cylinder engine that sports a turbocharger and a 48-volt mild-hybrid system that pairs an electric motor and a battery for excellent gas mileage. The design makes 248 horsepower and 258 pound-feet of torque. That's enough to send your new Volvo XC60 zipping down the road. Perhaps best of all, this sleek SUV looks great doing so.