30% more power on average?
Considering what the TV is actually doing, that's not too bad.
While a 4K TV doesn't require any more light to display a picture it is
switching on and off 4 times the number of pixels and passing 4 times
the amount of data through the system. Higher processing requirements,
more ram to refresh, it all adds up.
Don't care how much power the "Automatic Brightness Control" saves, it's
the most annoying feature on today's TV's and I always shut it off. When on,
most TV's brighten and dim more than your annoying neighbor's blinking