Real Time GPS Speed Graph to help MPG
 

My friend just told me about this app that tracks and graphs your instant speed, max speed, moving speed average (excludes time stopped), and total average all against time. I was going to upload an image of one of my runs, but the forum wouldn't let me so I'll use a different picture from the internet:
http://fs01.androidpit.info/ass/x51/...3201082123.jpg
It graphs about 10 to 20 minutes of data depending on your screen size. The scale can be adjusted for max value and units. Includes an altimeter and compass if you desire. This app is free by the way, though there is a paid version with export functionality.

Anyways, I was thinking that this would be a handy tool to help optimize P&G or other methods in the city if you travel the same route often. What are your guy's thoughts?