Still new to the model 3. This is my first winter with the car. At night I plug my car in and have not changed my percentage (80%) since my last long trip, months ago. Now over the last few days even after my normal trips the car has not reached 80%, after plugging back in. It seams to stop at 79%. I has been cold here, yet my car in parked in my garage and I've looked and it hasn't dipped below 35, with an average mid 40's parked inside. Is this normal for winter months? or has I done something wrong?