Actually you're a little off. This guy does testing for Volvo. He was in that fuel mileage "run on less" and averaged over 10 mpg hauling the heaviest out of the group.
He has a fleet of 6x2 adaptive loading Volvo and helped them dial it in. His dry vans average 10, decks are usually high 8.
You're right about the 6x2 being a tire killer. The driven tire has to be a gripper type tire and has to be run at a bit lower pressure. You still gain a ton.
As far as the picture I don't have details as he liked to tease but I do believe it's an electric axle and that other yellow blob is the battery pack. He did say the biggest benefit would be heavy in the hills so it adds up.
I do have a question, what are the best EGT thermocouples to run pre turbo?
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