Hello all! I'm the excited new owner of a Model 3 Performance (in blue) and have been nerding out in full force. I used to lease a chevy spark EV and nerded out on that car as well. After driving the M3P for over 2500 miles now, I started to notice my driving range between charges seemed kind of low when compared to the rated ~300 miles. I was keeping the battery between 30% and 80% SOT and would only get ~100 miles of range between there. So I did a 100% to 0% drive cycle over 5 days and got 210 miles. :-( I called tesla customer care to ask about it and were only offered possible variables that hadn't been ruled out. So naturally I'm on the quest to find out the reason for the ~33% reduction in range and am hoping you all will have some insight.
First, I live in southern California with constant mild weather and the car is parked overnight in a garage so I ruled out temperature extremes. Even now in December it is about 70 degrees out. Next I needed to rule out my driving habits so I didn't use WH/mile or the distance gauge as measuring tools. Since I had just driven the car down to 0%, I charged the car and used the vehicles KWH gauge to see how many KWHs it took to fully charge. This was done at home on 240 volt AC. It took 82 KWH. After some research I read that the vehicles onboard AC to DC charger has a loss of ~20%. My old chevy spark had about a 25% loss there so that seemed reasonable. However if the car took 82 KWH then that would mean my battery only took 65 KWH. I then drove the car back down to 0% over several days and got 208.6 miles out of it. The vehicle KWH gauge registered 56 KWH. :-O I scavenged the internet to see if this was normal and couldn't find anyone mentioning this happening to them. I did find a youtube video where someone tested the range of their M3 and they said the vehicle gauge showed 75 KWH used after a single 100% to 0% drive.
Next I needed to explore the parasitic loss phenomenon. I read that the M3 burns about 1% capacity (~.75 KWH) every day. After getting the battery to 80% SOC I let the car sit for a few days. The battery did indeed loose 1% per day over 3 days. Interestingly the car's KWH guage still read 0 KWH used. After losing 3% capacity to parasitic loses the guage should have read 2-3 KWH used. Perhaps the vehicle KWH guage doesn't register parasitic loses? I then tried running the vehicle heater and heated seats while the car sat in the garage until another 3% of the battery had been depleted. The vehicle KWH guage still read 0 KWH used! This surprised me because my old chevy spark registered all energy used on its KWH gauge. Aparantly my KWH gauge on the M3 only registers energy used by driving.
Have you all noticed this too?
Assuming that parasitic loses/climate controls aren't registering on the KWH gauge, then that would mean my car is losing ~30% energy to functions other than the drive motors. I now have about 3300 miles on the car and still notice per my car's KWH gauges that I'm getting ~60 KWH to use for driving per full battery cycle. This is even without using the climate control. With my average 270 WH/mile, that means i'll never be able to expect over 220 miles of driving range. :-( Even with hypermiling techniques I can't seem to get the car below 240 WH/mile and in order to get the rated 310 miles I'd need to get under 200 WH/mile with only 60 KWH of usable capacity to see the rated range. That seems unrealistic considering my old tiny FWD chevy spark averaged about 200 WH/mile. *sigh*
Tesla still hasn't received the carbon fiber lip and badging for my vehicle and i'm thinking i'll need them to test out the battery when those items come in. It's hard for me to accept that the rated 75 KWH battery will only hold ~60 KWH and/or that there will always be a parasitic loss that keeps me below 220 miles of driving range. But perhaps if you all are seeing the same thing then this is normal?
Any insight is greatly appreciated. :-)