The car has a digital speedometer that can be switched from MPH to KPH through the settings (but it takes several steps) but one day my wife was driving and the units had switched and she didn't know so was not driving at the expected speed. I know of no "shortcut" to switch it quickly. I posted the question on an "Ariya forum" and at least 6 other owners said they experienced similar.

- Gloucester, FL, USA

Car abruptly changed from mph to kmh. All safety aspects stay in mph, including speed limit and alert. So while on highway going 65mph, suddenly speed said 116kmh. But speed alerts were still saying -??65-??. Pro pilot on and car abruptly slowed down towards 65kmh on highway. Only way to change mph to kmh and back is to have car at complete stop, scroll to menu on steering wheel. Click it. Scroll to language. Click that. Click three more times. These options are completely locked out while the car is moving. Due to the danger of this happening on the highway, nearly avoiding getting rear ended, took to dealer. They reported nothing wrong. Reported to Nissan who said nothing wrong. Happened again today, not on Highway luckily. There are online posts of this happening with other Ariyas, but not on Highway. Again, if wanting to do this on purpose the car must be stopped and at least five explicit actions. Moreover, the safety measures on the car do not discriminate units, only numbers which makes this go from an annoyance to something that almost caused a high speed accident. Nissan has again been made aware, but lacks responsiveness.

- Dallas, TX, USA