The key seems to be entering an address at some distance away, and then actually being on a road on that route with enough miles BEFORE the next turn that the system shows multiple digits so the decimal is obvious. The dealer tech set a destination 40 miles away, but because the next turn was only 5 miles away, they weren't able to see the issue.
The screen shots definitely help. It took a while just to get them to understand that the issue is the discrepancy between the two screens.
This is exactly what I had to do to replicate your problem. Had to get on one of the long streets in Raleigh which was a pain as most of them were below 10 miles long