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I had a similar drop in battery myself. It used be 254 and in a few weeks it dropped to 220. At that time they also changed the representation to show theoretic

I had a similar drop in battery myself. It used be 254 and in a few weeks it dropped to 220. At that time they also changed the representation to show theoretical miles instead of raw miles as the default. So they used some algorithm to show higher range somehow. I didn’t use that representation and instead got the shock of my life when I saw the drop. Tesla support said there is nothing wrong with the battery. I would be really interested in knowing more about this case and what exactly happened.

Tempest1981 5y ago
Was there any up-front communication when this happened? "In order to keep your car's batteries safe, and ensure they have a long life, we're reducing the range a bit". And maybe throw in some free supercharging. Just assuming the surprise made it worse.
jcims 5y ago
Have you been able to determine if the actual range of the vehicle has changed at all? That's not clear to me from the article. I rented a Model X for a day and got about 60% of the estimated range (presumably due to my driving). After this update it would have only been 30% wrong instead of 40%. Not sure what to make of that.