It depends upon the vehicle and how you are driving. A roof rack on a Hummer driving around town will not decrease mileage by much. On a Prius driving cross country at Interstate speeds will.
Twotone
It depends upon the vehicle and how you are driving. A roof rack on a Hummer driving around town will not decrease mileage by much. On a Prius driving cross country at Interstate speeds will.
Twotone