I'm sure I don't know all the intricate details of the situation but it seems to me that mail vehicles shouldn't need huge ranges and therefore should be very good candidates for reducing oil usage and pollution by going electric.

I support this lawsuit.

From the link

The Postal Service currently has more than 230,000 vehicles, one of the largest civilian fleets in the world.

Of the 165,000 new mail trucks the USPS is set to purchase from the Wisconsin-based Oshkosh Corporation, just 10% overall are expected to be electric.