I had an interesting experience with my Garmin. I have the RV specific Garmin and we were in Prescott. We got in the toad and asked it to route us to Jerome, AZ, which is a small ex-mining town in the mountains. We knew it was about 30 miles away but the GPS said it was 110 miles away. We turned in on and off and it still said it was 110 miles away. We then realized the Garmin was still in RV mode and it knew the direct road going up there was no place for an RV. We put the GPS in car mode and it told us we were about 30 miles away!