Two versions of the Tesla Model S tops Consumer Reports road-test rating, which measures performance metrics like acceleration and braking. The P85D, which stands for the performance (P) version dual-motor (D) Model S, received a rating that broke through the product-reviewer's 100-point scale. The Model S 85 has only one motor. Both cars have 85 kWh worth of storage capacity. Tesla Model S prices exclude U.S. federal and state tax credits and incentives for purchasing electric cars.