Since I passed my test last year in October, and gained my Blue Car in November, I have racked up a modest ten thousand miles driving.
I have now started to learn the nuances of the car and if I leave in good time am able use soft acceleration and gentle braking to help preserve fuel economy. It helps to avoid the motorway as well. My best averages have been 56 mpg on a 40 mile trip and 60 mpg on a 12 mile trip. Both done in light traffic.