Does the cost of installing a airfoil on the cab roof of my truck offset any increase in gas mileage because of the aerodynamics? Does the airfoil effect handling of the truck while hauling a 35 foot ...
Tests have been conducted and from the posts I've seen over the years on the RV forums the gas mileage change is worse or very very small compared to no airfoil with the same driver/rig combination.
Better fuel mileage is constantly being chased by RV'ers. I've adopted the theory that when I'm out in my RV I'm not using the stuff in my home that runs up the electric bill. In addition, the pleasure and enjoyment of being out in nature or whatever the RV destination far out weighs any fuel costs.