Wanted to let you all know that I took my QX80 in on Monday for the 2G to 3G upgrade and asked them to look at the gas gauge issue. I even gave them the technical bulletin (thanks, Sawdust!). I made sure that I filled up that morning. Then drove 18 miles to the dealer and it had already dropped below full. They took a look, determined that there was a problem and ordered the parts. I'll take it back in and let everyone know the results as soon as it is complete.
Also, FYI, I've been poking around the Club Armada forums and it appears that some people are reporting similar issues with the new Armadas. I guess Nissan/Infiniti didn't catch the issue before the early run of 2017 Armadas.
2014 Q50 Hybrid Sport
2016 QX80 Limited