I've just purchased and started using my 2019 Leaf 1.5 months ago. I live in Montana where we get 9 months of the year cold/cool temperatures. So far I have 1900+ miles on this car. I've always drove my car/truck with hypermiling mode. Treating the A pedal like a feather and always scroll down to intersections without using B Pedal. This is the case on all ICE and this EV car. With N, D, B, EPedal features I've been playing with and trying to find the best ways to get the most efficiency out of this Leaf last 1.5 month.
Here is my findings so far:
First: I put this car on N while I was driving one time. I will state some facts below doesn't mean I do them or you should do them.
Second: I rarely use the heater and AC and rear defroster. If I start my leaf and leave it at P (Park) for an hour with heated seats and heated steering wheel I won't loose any range.
N driving: Say there is this downhill road for 30 miles and speed limit is 60mph and say you put your car in N mode and it goes right around 60 to 65mph with no need for break or accelerate. Hey this is the most efficient mode you could be in but there are not too many roads like this. You will either go too fast or too slow. This is just a scenario to make you understand.
D driving: On the way to work I loose about 600ft on elevation and usually the wind is behind me. I use D mode and it is 60mph speed limit. Drive around 50-55mph and get 5.4 miles/kWh. Hey it is 6AM in the morning nobody behind me no need to rush.
B driving: Usually in town when there is not much stop and go. On Icy roads B mode work very well on slow speeds.
EPedal ON: When there is a lot of stop and go, in heavy traffic. On pack snow, slippery winter roads ePedal is ON and it performs very well.
ECO: Usually leave it off as it is not economical to leave it on. I've done some test and regularly I get work miles/kWh
Basically there is no one most efficient mode to drive this car. It all verify depending on what type of a road conditions that I am in. You just have to figure out the most efficient mode on when to use it.
These are my findings so far. It might change as I put more miles on this car. So far I've used about $57 of Electricity on 1900 miles and very happy about that. My F350 could chug that much diesel in 200 miles when I am towing my camper. LOL