I'm sorry for asking this, no, I really am, but I have too. There is as setting in Maps (and I'm assuming in Sygic also) for Shortest, Fastest or Scenic. How do you have yours set? I don't have my phone available right now or I would give you the menu path. In the past, I have argued with Maps about the quickest route, all the way to the point of driving both at the speed limit to see. Google hasn't missed yet. If it isn't that setting, then I don't know what the issue could be. If you doubt what Maps says, you could go to maps.google.com and do the same route and see what you get there.
Let us know.