in 2010, the prostar was renamed the prostar+ as part of a model revision. coinciding with emissions and fuel-economy refinements (including 700 pounds of weight reduction), the prostar+ received updates to the interior to increase interior functionality. for 2015, a second revision was introduced as an option, making it the prostar es (efficiency specification). coupled with further exterior aerodynamic enchancements, the prostar es achieved further fuel economy gains nearly through engine and transmission controls; an automated manual transmission was standard.