For reasons too long to explain I have just brimmed my tank, very soon after it dropped to 7 bars. In theory 10 bars on a 40 litre tank is 4 litres per bar. 3 bars should have taken 12 litres. It took 14.5 litres, suggesting there is indeed some extra in the filler neck.

Range initially showed 594 miles equating to 67.5 mpg for 40 litres. My average over the previous 1300 miles had been 69.1 mpg ,and my most recent long trip (100 miles or so) was 74.9 mpg.

For the first 0.2 miles in ev mode I averaged 194 mpg -( if only

) But then the engine started,and a bit of a hill , It instantly dropped to 142 mpg, then a few seconds later into the 60's and a few seconds after that into the 50's.

During these rapid changes the range estimate dropped to 562, then soon after to 560, then 558. So it was still expecting me to average in the mid 60's even though at that moment I was getting low 50's mpg and worse.

Lifes too short to worry about how it estimates and calculates. Or to rely on it . The proof of the pudding is how much fuel you actually need to put in the tank, and whether you managed to reach the filling station.

As fans of "The hitchhikers guide to the galaxy " will know it took a computer 7.5 million years to work out that the answer to the ultimate meaning of life, the galaxy and everything is 42. Its right! 42 litres.

My 74.9mpg was on a trip to snowdonia , north wales. When descending from an elevation of 700 ft or so (a whole

213 metres - and they they call them mountains ! ) down to sea level I got well into the 80's mpg. Climbing again it was low 50's. Yet crucially the gradients were so gradual I didnt really notice the difference -but the fuel consumption certainly did.