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Second Full Charge had more mileage than first full charge!

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First full charge 1 week after I got the car was at 306 miles.

After two months of driving, this morning I have a trip and charged to full to a surprising 313 miles.

In that two month span I did get supercharging once.

I'm kind of surprised my battery hasn't degraded as fast as I thought!
 
Then what is the reason for an increase in range? I've been driving down the highway before and witnessed my range increase by a mile. What may be the cause of that?
It can also be due to random variation. I have seen between 306 and 312 on range charges and between 274 - 282 on a 90% Charge. Virtually all numbers vary around a mean and you need a lot of data to determine trends. I see this even more on my Roadster.
 
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So to add some data to this thread. Owner since February and have almost 10k miles.

Typically charge at home 70%-90%. Have used a dozen supercharges on road trips. Have full charged 6 times.

Range shows 313.

For comparison my 2016 S60d never showed 218 miles on a full charge. Most was 216 and at 10k miles in I was down to 208. By 20k miles it was 201.

Federate rebate dependant of course, I will not buy my Model X till it’s refreshed with the 2170 battery.
 
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