I've been tracking ALL my running costs on this car since the first day I bought it using Road Trip HD on the iPad. I've had her since 15 January 2016.
I've seen as high as 22mpg over the course of a full tank before, and as low as 14mpg over the course of a tank too - those low tanks skew the numbers slightly, but I average about 19mpg to a full tank with a good healthy mix of hard blasts (drops to about 10mpg) and motorway cruising (I've seen as high as 25.6mpg). The key for me is using the cruise control and settling into longer drives with the B&O blasting.
