Don’t Run With Extra Flaps
DON’T RUN WITH EXTRA FLAPS. Tankers, in particular, have a tendency to use both truck flaps with front fender flaps on their tankers. One or the other will usually suffice. Operating with two extra flaps generates at least 1/3 more wind drag on the highway from the flaps. The same is true for flatbeds. If you don’t have to run with extra trailer flaps from a DOT standpoint, then don’t. The extra flaps cost another 2-3% reduction in overall fuel economy for the rig. If trucks have to bobtail at some point, and don’t usually run with flaps, store them securely like you do bad weather chains, behind the rear wall of the cab where they can be accessed and installed on the truck when required.
