Thanks for all the replies again.
His car was built in 11/18 so unfortunately, that TSB doesn't include his car (I was hoping when I looked it up).
Some really good points I've read were:
1. Recommendations with the in-laws...avoid it
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
. I'm letting my wife do most of the talking.
2. Checking his alignment and tire pressure. He mentioned the car was pulling to the right when we did a test drive together. I just thought it was the crappy Staten Island, NY roads but that may will hurt range if it is off. We also didn't check his tire pressure which could cause the range to be lower.
He just said his avg wh/mi is 344 which seems pretty high for 500+ highway miles at 71mph with the heat set to 71.
He doesn't feel comfortable with FWD in the snow so he wanted AWD. Extra range doesn't mean anything if you don't feel comfortable driving it. He got 19" sport rims because it was a dealer demo that was $5k off and that was the only option.
I planned on giving him a list of all the superchargers and advice when/where to stop but he left a day early. Unfortunately, I'm out of the country and even when I'm not, I only see him a few times a year because of distance.