So, have just fully filled the car for the second time since having it one month, so able to do an initial calculation. At 410 miles, showing 1/4 left, it was 45.9 actual, the car showing 49.1. So the usual 10% over estimation that most trip counters display. It has been in eco-pro (with s/s disabled) most of the time and showed a 'gain' of 28 miles. I'd say half urban commute of 6 miles each way, the other half having an hour-ish journey at each weekend leisure trip. This reflects the likely duty cycle it will endure while it lives with us. Even though it is a boxy shape, the cd is 0.26 so fairly aerodynamic, but counteracts this by being a bit heavier than you'd guess at 1400+kg. I did hope it would be a tiny bit better than this, it takes a much longer time to warm up than I thought, which really can't help. Not the end of the world though, I didn't buy it solely for the ultimate economy.