I just leased a 2005 C320 4Matic. Great car. Got a question on the navigation. Tonight I was playing around with the navigation, using it to come home from the highway. When I asked it to plot a course home, it had me exit the highway and instead travel on a 2 lane road with lights. Seems like that was a longer way to go. Question, is there some preference that is pre-selected on the navigation which avoids highways when searching for the quickest route to the destination?