I am having a hell of a time getting rated range on my 2017 75D (21" wheels). I took delivery last September and have since put on 3,580 miles with an average Wh/mi of 338, nearly 13% off the rated value of 300 Wh/mi. That turns my 259 miles of rated range into ~225mi. This is a problem for a ~212mi trip I take every month or so; it forces me to take Supercharging detours, which isn't the end of the world, but is frustrating because the math I did before buying the 75 seems bunk. I drive 100% of the time on "range mode" and try to use the heated seat/wheel for warmth instead of the heater. When on the trip mentioned I am generally listening to music, and it is usually just me (~170lbs). Any tips? Or is this fairly common? PS. This happened yesterday. What the hell is wrong with people! I wanted to scream.