Motor Vehicle Fuel Efficiency Act of 1991

Motor Vehicle Fuel Efficiency Act of 1991 - Amends the Motor Vehicle Information and Cost Savings Act to establish average fuel economy standards for passenger automobiles and automobiles other than passenger automobiles (light trucks) for model years 1996 and thereafter.

Requires the Secretary of Transportation to provide for a review by the National Academy of Sciences of the current state of research and development in light truck fuel economy and passenger automobile fuel economy and an assessment of the potential for improving the fuel efficiency and reducing the energy consumption of passenger automobiles and light trucks. Directs the Secretary, using such review, to establish a schedule for increasing average fuel economy standards for passenger and nonpassenger cars for model years 2002 through 2006.

Revises criteria with respect to the testing of fuel economy for passenger automobiles.

Requires automobile manufacturers to affix to each automobile a label that contains fuel economy values specific to such automobile's particular vehicle configuration where that vehicle configuration is less than the fuel economy standard applicable to the vehicle's manufacturer.

Requires the Administrator of the Environmental Protection Agency to report annually to specified congressional committees on a study of the accuracy of fuel economy testing of passenger automobiles.

Directs the Secretary of Energy to distribute at least 100 explanatory booklets each year to every dealer and additional numbers if requested.

Doubles the civil penalty for repeated violations of the fuel economy standard.