The Ford-Utilimaster Flexible Fuel Vehicle (FFV; originally designated the Carrier Route 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.

[2]: 121  At the time, the phased implementation of the Energy Policy Act of 1992 required that 75% of federal fleet acquisitions were alternative fuel vehicles in fiscal year 1999.

The prototypes were tested between March and July, and the feedback provided was incorporated into the final inspection vehicle, delivered on August 30, less than a year after the initial contract award.

[4] The FFV was equipped with a 3:55:1 final drive limited-slip rear axle, powered by the 4.0L Cologne V6 through a 5-speed automatic transmission.

[9]: Table G-1 At the time they were acquired, the only flexible fuel-capable engines were 6-cylinder types, which proved to be heavier and less fuel efficient than the 4-cylinder engines in the LLVs; in addition, E85 has less energy than gasoline, by volume, and it was estimated the USPS used 587,000 US gal (489,000 imp gal; 2,220,000 L) of E85 in fiscal year 2010 at a cost premium of US$135,700 (equivalent to $189,600 in 2023) compared to using gasoline vehicles.