"(C) work trucks and commercial medium-duty or heavy-duty on-highway vehicles in accordance with sub- section (k). "(A) AUTOMOBILE FUEL ECONOMY AVERAGE FOR MODEL YEARS 2011 THROUGH 2020.-The Secretary shall prescribe a separate average fuel economy standard for passenger automobiles and a separate average fuel economy standard for non-passenger automobiles for each model year begin- ning with model year 2011 to achieve a combined fuel economy average for model year 2020 of at least 35 miles. per gallon for the total fleet of passenger and non-passenger automobiles manufactured for sale in the United States for that model year. "(B) AUTOMOBILE FUEL ECONOMY AVERAGE FOR MODEL YEARS 2021 THROUGH 2030.-For model years 2021 through 2030, the average fuel economy required to be attained by each fleet of passenger and non-passenger automobiles manufactured for sale in the United States shall be the maximum feasible average fuel economy standard for each fleet for that model year.