• All Products • Exterior Accessories • Nerf Bars/Step Bars • Tonneau Covers/Bed Covers • Performance • Interior Accessories • Lighting • Electronics • Extreme Off-Road • Diesel Performance • Jeep Accessories • Hummer Accessories • FJ Cruiser Accessories • Fuel Economy         Categories         TONNEAU COVERS Tonneau covers can improve your truck's fuel economy by as much as 12%!! Recent studies have proven that at highway speeds, tonneau covers reduce the drag caused by turbulence in a truck bed. Contrary to popular belief, driving with the tailgate down actually increases this turbulence! A tonneau will improve aerodynamics and in turn improve mileage.             EXHAUST SYSTEMS Low restriction exhaust systems help your engine breathe, increasing horsepower and improving fuel economy at the same time!             PROGRAMMERS/CHIPS Today's engine programmers and power modules let you tune your engine to increase power, responsiveness, driveability, and improve fuel economy! In-cab controls allow you to select the preset tuning parameters as your needs change.