I filled a complaint to Yamaha Motors Canada today for this issue. I was not aware about it when I bought my new bike recently, so didn't try to negotiate some rebate.
I was surprised when I crossed the border to US and tried to switch the units to MPH.
Finally, sorted it out by using my GPS to watch the speed limits but from safety point of view it is more dangerous because the digits are so small. It can be really a safety issue because you are distracted to find with small digits on GPS your speed or calculate it in your head.
So, I'm waiting for response form Yamaha. If nothing will fill a safety issue complaint with Transport Canada.
When dashboard reflects some sun light I can clearly see that display has MPH section.
I ride often in US, my older cheaper Kawasaki had this option by default. It's so stupid not to have it in Canadian models, I don"t really care about gray market or whatever they can say me but I see there a safety issue.