Max Regen

The max regen on my Bolt is 70 kw. Max charge rate with a level three charger is 55 kw so regen is ~27% more. The Hummer is said to have a max charge rate of 350 kw so assuming the the same 27% delta we should expect a regen rate of up to 445kw? Has anyone read what the max regen is or experienced it for themselves?