I get an average of 36mpg at 70 with minimal overtakes. Manual, 40k, stage1 tune. Have got 41mpg over 190miles at 55-60mph.
It's not all about speed though... Having a twitchy right foot can drop it considerably despite you not actually going any faster.
Is the car regularly serviced, does it have all the power you'd expect, idle smoothly, tyre pressures good, does it roll freely on a slight incline (no binding brakes)?
Sent from my iPad using Tapatalk