in the hybrid model. Forced features This category measures how many premium or upgraded features, called forced features, are included on a hybrid model as standard equipment in comparison to its sibling conventional model. UCS considers that these forced features make it less economical for consumers to buy a base hybrid model. UCS calculates the cost of forced features as the difference in MSRP between the base conventional model, with no upgrades, and the base hybrid model, and then the estimated cost of the hybrid technology is subtracted. This category is scored quantitatively from None to $$$$$. Vehicles with no forced features are assigned a rating of “None” meaning that the additional costs for the vehicle only cover the cost of the hybrid system. Vehicles that have or more of forced features are assigned the maximum of “$$$$$.” The other scores are defined in intermediate ranges of . 2010 Scorecard The U.C.S. evaluated 31 hybrids from the 2009–10 model years for the 2010 Hybrid Scorecard. The 2010 Toyota Prius scored top marks in the categories regarding environmental benefit and hybrid value. The UCS found that, compared to its closest conventional counterpart the Toyota Matrix, the Prius emits 44% less global warming pollution. The Prius score on forced features was rated relatively good, as the car came with worth of forced features. For the 2010 Hybrid Scorecard the evaluation found that the worst offender was the luxury Lexus LS 600h L hybrid which came with more than in forced features compared with the conventional, base model Lexus LS 460L. The 2010 Scorecard was updated in April 2010 to include new hybrids that have been launched in the U.S. market such as the Mercedes-Benz S400 and the BMW ActiveHybrid X6. 2011 Scorecard The 2011 Hybrid Scorecard evaluated 34 hybrids from the 2011–12 model years sold as of April 2011. The 2011 evaluation found that only 13 of the 34 hybrids available in the U.S. market reduce more than 25% of greenhouse emissions compared with their gasoline engine counterparts, but the 2011 scorecard now includes more top performers than it did in 2010. The Toyota Prius remained the top nonluxury model in the environmental improvement category by emitting 40% less greenhouse emissions than comparable nonhybrid models. In the luxury category, two new additions, the Lincoln MKZ Hybrid and the Lexus CT200h accomplished similar performance, an achievement the UCS attributed to their relatively small