New Price! Stone Gray 2018 Ford F-150 King Ranch 4WD 10-Speed EcoBoost 3.5L V6 GTDi DOHC 24V Twin Turbocharged 4WD. Price excludes tax, title, license and dealer fees but does include the following rebates. See dealer for details with any questions: $750 - Retail Bonus Customer Cash. Exp. 07/09/2018, $750 - Ford Credit Retail Bonus Customer Cash. Exp. 07/09/2018, $750 - Retail Customer Cash. Exp. 07/09/2018