The ability to pre-heat will save a good chunk of energy. Also, don't be like my wife and set the heat temperature at 85F and then start cracking windows when it gets too hot inside.
Instead, set it to something lower, but enough to take the chill out of the air. I usually have mine set for 68F in the winter because it will blast you with heat when it needs to raise the air temperature when you first power up, but once it gets warm enough that it takes the chill out of the cabin, the seat heaters and steering wheel heater take care of the rest and save a lot of energy if you dressed warm, etc.
Also, try to re-circulate the air as much as possible. It's easier in the day time because the Sun will help to burn through any window frosting, but at night when you really need to see, minimize the defrost to the lowest setting that works to keep the windshield clear. Anything higher and it's basically just blowing all that energy it used to heat up the air out the back of the Leaf since it will be using the fresh air setting.