before i put in my livorsi tattle tale i used my android phone. The fastest run i had on my android was 69mph, after i put in the tattle tale the fastest iv logged is 66.5mph. There appears to be a difference between my android and my tattle tale.

That's because android phone suck! Apple rules!!!! Just kidding. Although I did move from a droid to an iPhone and have not looked back.... Anyway, I am sure that variance is based on the signal triangulation. I notice when I had a droid it's GPs was not as accurate (in regards to my Garmin fixed GPS) as my iPhone is. Again, probably all in how each piece of hardware process it signal. The gps in phones wasnt designed to be a speedometer. The fact that they are within 1-3mph based on cell signal is very Impressive...

Very impressive, because I know nothing about how these things work but I was very impressed how the dial on my speedo and the dial on the iPhone app were so in sync with each other...... While excellerating, at speed and slowing down. Pretty cool......