How are you determining range? Using dash, then add 10%. (Its actually more but some people don't like peering over the edge) Get LEAF Spy. It should be standard equipment offered by Nissan if you want to be realistic. Its value to the nameplate and to the customer CANNOT be overstated.
One thing to keep in mind; Do not discount anything you have been told. You don't have "an" issue. You are experiencing the sum total of many many issues. For starters;
ALWAYS post your location. There is very little advice that can be targeted to you w/o it. ESPECIALLY when it comes to winter range advice.
Dress for the weather. Blowing range out the window with climate controls is something I simply can't understand. Your weather sounds similar to mine. I dress warmly, use seat heaters/steering wheel and my need for heat is reduced. I use it if I need it or want it but even with a much longer range, I don't simply use it but then again, I don't wear a lightweight sweater in freezing weather. That is simply insane.
Check your tire pressures; The max is 44 PSI Before you start driving. Driving will increase tire pressures and that is ok. What you put yours at is up to you but I would not go lower than 40 PSI for any reason. FYI; air tends to leak "out" When you get me a tire that tends to leak "in", let me know and I will reevaluate my advice.
Moderate your "power" output, not your speed. Its the power that drains the pack, not speed. What do I mean? Well, you can go downhill at 70 mph and use little or no power so speed ain't the thing you need to watch; its those power pips, circles or whatever you got to look at. This means steady flow! Blend in with traffic. Don't be a leader or a laggard. Regen is NOT your friend (at least its not your "best" friend) so minimize regen, eliminate braking (as much as possible). Yes, it means a larger following distance, timing lights, anticipating your roadmate's moves, etc. No its not easy but what goal worthy of ambition is?
Keep it clean!! Airlines wash planes because clean planes use less fuel!... But that is not what I am talking about here
I mean your inside glass. Clean glass fogs less. Less fog = less defrost = less range out the window! (or on the window in this example
) So get out the windex, scrub that glass and then polish it off with Fog X (the interior version of Rain X) or whatever copycat products Amazon is bound to have several dozen of.
Keep it dry!! In my area (Pacific Northwest) moisture creeps into the car no matter how careful I am but that is ok. I have weapons. I use 3 desiccant thingys. They have a little window and when it turns blue, take out of car and plug into wall for a few hours, they revert to Gold and ready to return to car. What you get? Amazon is your friend, but you get the idea! Ever get home and your back hatch glass is fogged over? Ever do something about it? I have microfiber towels (Nissan dealership was handing them out at NDEW events) I wipe down glass (surprised at how much moisture there is) bring into house, hang over heat register. I have like 10 of them (yeah been to a LOT of NDEW events) but those towels are holding tiny water droplets who have booked flights to your windshield. So unless you want an army of water droplet selfies blocking your view...Get rid of them!
**cue "Taxi Driver monologue** Yeah, I am talking to you! Don't make the first mistake of thinking only part of what I said applies to you because IT ALL APPLIES TO YOU! It is up to you to decide how much it applies and how much you plan to do about it. Like I said, nothing above will significantly change your life (or your range) but add it up. Ants eat people. Now granted we are talking one person and 7,000 Ants but it ALL ADDS UP!!
Have a nice day!