I must admit, I no longer measure it exactly. I take my figures from the DIS, and mentally subtract a couple of mpg. On that basis, mine ranges from about 34mpg in mixed daily driving, to around 43mpg on a steady 70-plus motorway cruise. What I do find gratifying is that if a busy motorway forces me to cruise at 60-ish, the figure can go up to nearly 50mpg. That kind of makes up for the frustration.