I was doing about 70mph heading up the A9 from Paisley to Tain and I got 58mpg. Which I thought was great. I like the car cos its got good pulling power and its great on fuel.
Dumfries I hope your happy with it cos its not a bad wee car.
I did a long drive (to Birmingham) once and due to traffic I was driving at 60mph almost all of the way.
The fuel economy was quite bad (quater of a tank) just to get there.
Drove back at 70-ish and used an 1/8th of a tank !
Hence my reasoning that at 60mph the fuel economy was quite dire (as the turbo was not fully in boost).
So now I drive mainly at 70mph and get 50mpg (which is not too bad), but will drive at a sedate 60mph after the next service and see what I get then.