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I think it's a combination of too low range and the price point.
Keep in mind that the RAV4 EV (it has 41.8kWh) is pretty close to a 40kWh Model X. It think they don't want to cannibalize RAV4 EV sales.
As best I can remember, they've always said it would be offered in only 60 or 80kwh configurations. They've never publicly shared the reasons why, but elsewhere on the forum people have speculated that range would be too low (the X will not be as efficient as the S) or perhaps that the 40kwh battery was only offered to get the price below $50k (w/tax credit).
My hope is that the reason is they won't be making 40 kwh batteries by then, only 60, 85 and 100 kwh. They just don't want to announce the 100's yet.
A few reasons:
- The Model X will be towing capable which requires more torque and therefore more power
- Range
- Tesla makes (or at least will make) a larger margin on the bigger battery models and because the Model X will be more expensive to make, yet cost the same as the Model S, the 40 kwh model is not justifiable.
I doubt it has much to do with RAV4EV competition.