WASHINGTON — The US Postal Service’s promised all-electric fleet is still woefully behind schedule, with more than $3 billion in taxpayer funding out the door and just 612 of the expected 35,000 battery-powered delivery trucks built, according to a letter sent to Sen. Joni Ernst (R-Iowa) and obtained by The Post.

Former President Joe Biden’s 2022 Inflation Reduction Act (IRA) set aside $3 billion for what Ernst has since ripped as a green “ boondoggle ” that saw almost all of that amount paid to Wisconsin-based defense contractor Oshkosh to build the environmentally friendly mail trucks.

Ernst, who chairs the Senate’s DOGE caucus, said in July of this year that with $2.6 billion paid to Oshkosh and just 250 trucks produced so far she was “working to cancel the order and return the mo

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