Honda did this same tactic for the Accord, as it has an analog speedometer for the 2018 model year (all-new 10th Gen, as 2017 is the last model year for the 9th Gen), whereas the CR-V, Civic, Pilot, and maybe the new 2018 Odyssey has a digital speedometer. So I guess, this isn't just a Nissan thing.
And for the gas thing when it shows below 50 miles range remaining... that isn't true most of the times as Autovlog done two videos on what will happen if the range meter shows 0 miles:
(NOTE: Autovlog used his 2015 Fusion 2.0 Ecoboost and 2015 F-150 with a V8)
https://youtu.be/l_fD7RVd3m8
https://youtu.be/iFIfFc_wY-w