Tesla owners in Florida may be grateful for this mileage boost as they escape the ravages of Irma but I suspect that some of them will be upset when they have more time to reflect. How could Tesla increase the mileage at the flick of a switch? The answer is that owners of the Tesla 60kWh version of its Model S and Model X actually have the same battery as the 75kWh vehicles but the battery has been purposely limited or “damaged” to provide only 60KWh of mileage. But why would Tesla damage its own vehicles?
The idea of offering both premium and discount versions is common, as is purposely 'damaging' the product one so as to make the discount version perform more poorly than the premium version (i.e. "Crimping").
In this case though, there may have been no deception. There is a report that owners may have opted not to pay for the better battery life.