A Norwegian gentleman named Geir Kokkvoll Engdahl has created an absolutely stunning Google map overlay which will allow you to calculate the most efficient route between multiple destinations, which he calls Optimap. No doubt Realtors are going to go gaga over this tool once they learn about it. For now, as a DROdio Real Estate, Inc. client, it's yours to start using today, and it's free! Here's a screenshot of a recent calculation we did using the tool, to find the best route to 9 destinations.