I have a 2014 FFE that I bought new. I've put 79,200 miles on it. My commute to work is 54 miles one way, and about 52 miles of the trip is interstate which I drive at 60-63 mph. During the summer I set the A/C to 68 degrees, and I would arrive at work with 20-25% charge remaining. Now that temps are in the 30-40 degree range, I have to stop at a L2 charger for about 20 minutes to make it with roughly a 5% reserve. I don't use heat, defrost, or any other environmental controls at all.
I've noticed that the charge goes from 100% to 70% within the first 10 miles of driving. The car is always plugged into a L2 charger, and I use preconditioning. If the charge dropped at that rate over the entire 100%, I'd only have about 35 miles range. Instead it's about 50 miles at 60-63 mph. So is that fast discharge of the first 30% just normal degradation, or is something wrong?
Today I went for a ride with the heat on, 60 mph, 38 degree air temp, and it dropped from 100% to 70% in the first 5 or 6 miles. The heat usage cycled between 3-5+ kwh for the entire 5-6 miles, but still, 30% used in 5-6 miles?
Hate to go through the hassle of taking it to a dealer (there's not one nearby) if they're just going to tell me it's normal, but I'll also be outside the warranty very soon, so.... If it were your car, and you saw what I describe, would you take it in or just accept it as normal degradation? Also, how would they diagnose a bad battery if that's what's actually going on?