Here in the NY Metro area it has been quite cold lately. I am new to my M3P (12/28/18 delivery), but not new to EV driving as I have had both a 2012 and 2016 Volt. How you drive is so vital to these cars. In my 2016 Volt I have gotten as much as 70 miles on one charge. My wife driving the same car in roughly the same conditions will get 50. She's just a more aggressive driver than I am -- accelerates more rapidly, stops shorter and really doesn't care about range -- and in a Volt you really don't have to.
My early experience with the M3P is that I use anywhere from around 240 Wh/mi to 360 Wh/mi -- all depending on driving style, speed and climate conditions / topography. I am certain that in the Spring and Fall (with little or no need for climate control) I will easily get down into the low 200's...but all of this is besides the point as ultimate range is NOT why I bought the M3P. My decision to go with the M3P was because of its completely unique BALANCE of range/efficiency with stunning performance.
I have always wanted my daily driver to be efficient and the list of cars I have owned for this purpose is like a who's who of the genre -- Honda Civic VX, Prius (Gen 1), Prius (Gen 2), 2012 Volt, 2016 Volt. BUT I have also always also loved cars that perform and suffering through the Gen 1 Prius -- as innovative a car as it was at the time -- was sometimes a real challenge. Over the years my performance cars have included several Alfas, BMW 3-series (when they still were actually driver's cars), an Audi S4 and two Ferraris (360 and 430).
Minus the roar and getting 12 mpg, the M3P is literally like the synthesis of everything I loved about my Ferrari 430 along WITH the 2016 Volt and THAT is what I believe this car is all about. If I wanted exclusively range? The RWD, for certain...
One last completely off-topic rant...the fact that GM could not make a smashing success of the Gen 2 Volt is proof positive that they are completely inept when it comes to marketing. As an everyday driver with a large enough battery to cover the amount the average American drives every day as a pure EV coupled with an "unlimited range" for long trips (owing to the onboard ICE), if positioned properly it should have been the perfect transition vehicle to get us to the day when we live in an all EV world...