Hi Struth
yes that is why I am going for the Kona ultimate – good range on paper and forums backing that up with real world accounts – also I am hoping with the ability to warm car up whilst plugged in then just use heated seats and steering wheel that will help me to extend mileage on the occasions I need to – similarly with sunroof to let heat out and reduce the need for air con – time will tell, but I would have thought it has got to help!