Had my EX CVT for 3 weeks now....done 500 miles (mostly on M5 and60-65mph) and a little disappointed at the real world ( .... yes I write down petrol fill-ups into a spreadsheet......sad) mpg.
I'm getting 42-45mpg....I was getting 55-60 in the manual SE. I'm guessing that the engine is still "tight" ?? and we've had c-c-c-c-cold weather.
Though I thought engines were now "run -in"??
I felt my engine was tight when new. It seemed much happier after 15000 or so, but this is subjective. It wasn't reflected in fuel consumption, but I may have been driving harder as it loosened up. Engine seemed quieter and smoother too.
I track all my fuel usage with Fuelly on my iPhone. Very easy to add litres and miles while still at the pump. Attached is a current screenshot from my phone. (Data is also uploaded to Fuelly and accessible on computer).
Overall average is 46.0 average over 23,328 miles. I am not a hypermiler, and use the performance available up to the speed limits.