I used an app on my droid not sure if its the same one this morning just to see how accurate it was. And the final result:it sucks big time. According to my phone my average speed was 21.6MPH with a top speed of of 38.1MPH, and the numbers from my cycleputer is an average speed of 14.1MPH with a top speed of 29.7MPH. Just a slight difference there