Posted in Article Next-gen USPS mail trucks are only capable of 8.6 mpg, EPA says 2022-02-04 Leave a Comment on Next-gen USPS mail trucks are only capable of 8.6 mpg, EPA says It’s claimed the USPS did not consider environmental impacts as required by law. Source: Next-gen USPS mail trucks are only capable of 8.6 mpg, EPA says