Hurray! This is cool.
Everyone knows that WLTP, the European fuel efficiency test cycle, is way off, and the more fuel efficient (FE) the vehicle, the bigger the discrepancy with real-life driving efficiency.
So now we have (potentially) a real-world measurement. I hope they publish this in all its glory, by which I mean including distributions of FE not just the average.
Doesn't help the first buyers of the model, but helps the ones willing to wait.