Vortex Generators (set of 26)These unique aerodynamic vortex generators [VGs] install quickly and easily around the rear of the truck cab and the rear of the trailer. Our VGs efficiently directing passing air to delay flow separation and reduce subsequent drag for a more aerodynamic ride. With less drag, your engine doesn't work as hard, reducing fuel consumption and saving you money. Easy installation in as little as 30 minutes without special tools 1% increased MPG when