Also, I think that view only looks at the vehicle itself and neglects the onerous funding model the USPS is saddled with and the investment required on the supp

Also, I think that view only looks at the vehicle itself and neglects the onerous funding model the USPS is saddled with and the investment required on the supply chain/logistics side. The fleet itself is a massive capital investment. But changing the fuel would be sizable as well. The USPS already has a supply chain network and facilities for gasoline. Replacing that will be huge in itself. Municipalities are a better first-step and have had some success with moving bus fleets and maintenance vehicles to NG or EV. But they usually just have a handful of fueling stations and suppliers. Fleet renewal is a pretty well understood budgeting process in any large scale logistics network (airlines, military, delivery..). You reach a point where replacing the fleet is a better investment than maintaining the current one. To migrate to EVs, the USPS would likely wait out success in the private sector (like FedEx’s announcement) to demonstrate ROI, and retrofit this design or phase in a 2nd or 3rd iteration on it as a separate budget/RFP process.