Interesting.
Suggestion for all those useless bits out there who moan on about environmental issues. Go to the SMART CAR webpage, BUT don't click US. Instead, click UK and meander through until you find the mileage!!!
THEN go back and click US, same car, and click/find mileage!!!!!!!!!
Interesting.
(that's all I will do for you, the rest is up to you - but I am left wondering!)