I am in the chip industry, specifically power consumption.Although it does seem suspicious that a chip would drain 7 miles worth of energy. But I'm not a car expert.
Chip power consumption is the number one issue nowadays, since everyone’s chip basically works. Power and performance are huge issues.
I would not be surprised if the the range reduction happens due to power hungry semiconductors.
My Model S used to lose 12-15 miles overnight when I bought it in 2013 just sitting still. Some of that was due to BMS, but even in fair weather of spring, it still managed to lose a lot of miles. Tesla made changes to the software to not constantly communicate stuff over the wifi and the loss dropped to about 7 miles.
It still manages to lose 7 miles overnight.