It is probably your tailgate. Passing air rushes over your trucks cab and flows directly into your open bed. With now here to go, the turbulent air crashes into your tailgate. Consider an Air flow tailgate. Without a drag prone tailgate to slow your truck down, you will see a gas mileage improvement immediately that exceeds unsafe driving with the stock tailgate down. Features Style - V Shaped Non Louvered Type - Flow Thru Finish - Powder Coated Color - Black Material - Steel Latch Type - Non Lockable Constructed From 16 Gauge Steel And Designed To Install In Minutes Affordable Low Cost Gates With The Benefit Of Air Flow Design Applications 1998-2003 Ford F-150 2004-2004 Ford F-150 Heritage 1999-2015 Ford F-250 Super Duty 1999-2015 Ford F-350 Super Duty - SKU: KSAO61292

It is probably your tailgate. Passing air rushes over your trucks cab and flows directly into your open bed. With now here to go, the turbulent air crashes into your tailgate. Consider an Air flow tailgate. Without a drag prone tailgate to slow your truck down, you will see a gas mileage improvement immediately that exceeds unsafe driving with the stock tailgate down. Features Style - V Shaped Non Louvered Type - Flow Thru Finish - Powder Coated Color - Black Material - Steel Latch Type - Non Lockable Construct