Tried a fuel economy driving style on a shortish trip today. Refuelled the car, the estimated range displayed on the instrument cluster was 610km. My driving style was conservative, there were few hills and none of those were at all steep. I set the cruise control to a maximum of 90 kph ( otherwise I used a mix of 100 or 110 depending on the various speed limits. I drove with steady acceleration, only allowing the adaptive cruise control to do the last 10-15kph of the acceleration as it tends to be more prone to kicking down into lower gears. I also deliberately selected 6th gear, whereas the car had opted for 5th (both are overdrive ratios).
At the end of the 125 km trip, the range estimate had dropped from 610km to 570km. Very promising, if I can keep it up.