I installed my link yesterday and I had to drive from Albany (NY) to Hartford (CT) so I decided to do a little experiment: the first hour I drove normally and the second hour I drove as Automatic wanted me to (avg speed below 70 mph). According to Automatic, I went from 33mpg to 43mpg! I will do my own calculations to make sure that the mpg rating is right, but that was a hell of a difference. I'm an android user, so I'm waiting for new functionalities to come in. I was also worried that it would use my bluetooth connection constantly, which is a problem for me since I use bluetooth to play music (from my phone to my car). I was impressed that the link connects perfectly even when I have a bluetooth connection constantly running from my phone to my car. I'm using a Droid MAXX HD running Android 4.1.2 on Verizon.