I've used it to commute a couple of times too very straight and dull.
So at last fill up I clocked the Km's (277) and Litres (18.09, so still 2 liters left?) and did the sums turns out to 6.53 l/Km.
So what! well I thought that too 'coz I've no real perception what that equates to in mpg so I did the conversion and was impressed with the 43.25mpg figure as this included twisty and commute stuff.
What really amazed me was the 277Km turns out to be just over 172 miles. Admittedly the light was on for a long time, but I would never have expected that distance, probably be happy to push 150 (240Km) in the future rather than the 130 I used to.
Mind you I used to get just less than 100 miles to the light when commuting in London.
Edited to add that as soon as I posted this I realised that I mustn't be trying hard enough in the twisty bits to keep the consumption that low
