That seems really out of proportion with the experience of others, you may want to get it checked out. Do you have an older model with resistive heat and no seat heaters?
My car has a heat pump. I am basing the numbers off of the range estimates the car provides when I turn off cabin climate. The range is still lower, but I assume another chunk of that is from heating the battery when it's 10°F outside.
Rated: 230 miles
10°F with 70°F climate: 160 miles
10°F with no climate: 190-200 miles