Yes, Roof Boxes And Ski Racks Really Do Cut MPG—More Than You Might Think
Green Car Reports
APRIL 15, 2015
Fuel Economy aerodynamics mpg If you follow our coverage on fuel efficiency, you know that real-world mileage numbers don''t always measure up to the official EPA ratings. But if you think failing to meet those EPA numbers by five or ten percent is already a letdown, be very careful about your cargo-carrying expectations in your next sedan, hatchback, or crossover. Adding any.