I know this is a bit early, but I'll be leaving my Leaf for 10 days over Christmas at the airport - which is far enough away that it will definitely need a charge to get me back home afterwards.
The temperature in the UK at the end of December is variable (as it is for the rest of the year)... it could be -10C (14F)... it could be +10C (50F)... there is no way of knowing this far in advance. To be fair, there's little chance of knowing a week before hand!
Assuming it's in the 0C (32F) to -10C (14F) range, is it better to get to the airport and use the fast-charger (to get it 80%) and then park up for 10 days. Or is it better to park up, leave it for 10 days with approx 30% charge and use the fast-charger before coming home?