The Postal Service is reminding fleet managers and drivers to always buy regular unleaded and low-grade diesel fuel from stations in the USPS Preferred Fueling Network.
The network, known as PFN, has 39 brands and more than 26,400 retail fuel sites.
A list of participating locations is available on usps.com.
Email USPSPreferedFuelingNetwork@usps.gov for additional information.