Deflector
I have seen attached to the top of TV a deflector and was wondering if it is really necessary.
Forum Discussion
Even if it saves you a small amount in MPG while towing it costs you mileage when not towing as anything in the airflow will do. That means if you are really concerned about mileage it must be removed when not towing which for most people is the majority of time the truck is used. Taking it on and off and storage issues can be a real hassle so most just leave it on which defeats the whole purpose. If you are on the road most of the year at some point, in a few years, you may get even on the cost. For the occasional user the break even point if ever would be many years down the road.
