I see that a number of people want their unit to avoid unpaved roads, and can't make it happen. I have the opposite situation. Many of the roads around me are unpaved, but I want to use them, so I chose never avoid. But my unit (Via 1535 LTM) wants to send me on a long route to get to a paved road, even when my destination is a short distance straight ahead.
I also have it set to Fastest Route, but have also tried Shortest Route. but it seems stuck on wanting to put me on a paved road, even though it is 5 times more miles and would take 5 times as long.