It's good that they used existing truck base and focussed only on the fuel. But I couldn't see any data on actual efficiency/mileage, the whole article was focu

It's good that they used existing truck base and focussed only on the fuel. But I couldn't see any data on actual efficiency/mileage, the whole article was focussed on how big the battery was on the big truck. "Its size and strength ensure it can transport materials from a mountain ridge to a valley 20 times per day." Is the only data on it's efficiency ?