...whereas we have a need for a car that can carry 2 greyhound sized dogs and a fortnight's shopping along empty but often winding and sometimes icy or very muddy roads. But not every day, and not in urban places.

If you used your Fiat every day to commute, for example, I would bet that my Impreza is producing a great deal less CO2 than your car is, week on week, and that it is having less of an effect on our local environment. It probably only travels about 50 miles a week on average.

I don't think the Chrysler will do, on reflection. We do need a largish car with decent road holding though.