I agree with above. While 44 miles may be fine in the spring summer and fall, it can be iffy in a blizzard or sub-zero temps. In such conditions, I've seen my normal 70'ish mile Leaf be below 40
with much heater use. It's crazy how conditions can affect range but I guess if you think of ICE vehicles, one that might get 30mpg in the summer could be hard pressed to get 15 in bitter cold conditions.
AFA your tire/rim question, personally I'd stick with the steelies, just don't care for how often AU rims leak, especially in the cold. Weight is probably negligible difference, winter tires on the other hand make a world of difference on the Leaf, making it go from a somewhat decent winter handling car to a very good handling car, I'd suggest them even if it means a slight hit in mileage. Truthfully when it's snowy and very cold I don't think they'll make as much difference as say using the same tires in the summer would, your range will be poor no matter what tires you use
Do you have a possibility of charging at your half way point? Even L1 would help a lot, I know it may be hard to believe how much cold/wind and snow can affect your range, but it does