I had Program Number 13B07 hardware/software upgrade installed at the Sunset Ford Dealership, St. Louis on 29 August 2013. I have been tracking my mileage at each fill-up (10 of them since my purchase in July). Prior to the hardware/software installation I was averaging 38.19 mpg. On the first fill-up after the installation (8 September) my calculation was 30.17 mpg, which is the lowest since purchasing my car. I am disappointed, as I have not changed my driving habits nor the driving area. I will continue to monitor, and report back.
