This tool called Dashfly save hours in planning my showings and tracking my mileage.

www.Dashfly.com is a simple, user friendly web based route optimization and mileage tracking tool

  Dashfly's Premium features include...
    * Optimized route for showing/touring as many as 25 properties
    * Turn-by-turn directions and drag/drop rerouting
    * Save routes and track mileage
    * Take secure notes with property information and client feedback
    * Email and print routes
    * Create mileage reports for tax purposes on a monthly, quarterly, and annual basis
     * Finding your most economical gas along your route
     * View routes as text on your phone
     * I-Phone Application

There is a promotional on the website at www.dashfly.com that give you the premium service for 30% off. Only $6.99 a month and you can cancel at any time. There is also a free trial and demo that explains how it easy it is. Let me know what you think of the site.