You're right Don, the calculator indicates 25 mpg in generator-mode. My bad.
It's not a very good figure. I still doubt whether it is correct (whether the calculator is correct), since it's the same mileage you get from a much bigger gas engine doing less steady rpm's, including accelerating.
By the way, interesting to see that the car automatically switches to generator-mode (sports mode) after 80% of the battery capacity has been used ($ 1,76 divided by $ 0,11 = 16 kWh of 20 kWh available). This is probaby done to preserve battery life. That 80% is enough to get you to 50 miles.
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I also have to correct myself on the colour: upon closer inspection it is not same colour ('shadow') as the car that went on a US-tour. I think the car in Paris is in a new colour we haven't seen before. It's more blue, so probably this is 'deep ocean'. Now we're only waiting for 'white sand' and 'earth' on a real car.