The Ford-Utilimaster Flexible Fuel Vehicle is an American light transport truck model, designed as a mail truck for the United States Postal Service (USPS), which is its primary user. It was built as a partnership between Ford Motor Company, which supplied a stripped-down, right-hand drive Ford Explorer chassis and drivetrain, and Utilimaster, which built the aluminum body and integrated it with the chassis. The FFV can operate with either unleaded gasoline or E85 ethanol-blended fuel using the Ford 4.0 L Cologne OHV V6 engine.

The United States Postal Service (USPS), also known as the Post Office, U.S. Mail, or Postal Service, is an independent agency of the executive branch of the United States federal government responsible for providing postal service in the United States, its insular areas, and its associated states. It is one of the few government agencies explicitly authorized by the Constitution of the United States. As of 2023, the USPS has 525,469 career employees and 114,623 non-career employees.