The automatic spoiler is currently only available for the Model X P90D(L) configuration, where it is included in the base price. Currently, the 90D (and presumable the 70D) comes with a fixed spoiler only. I think the automatic spoiler should be offered as an option for the 90D because:
- The spoiler increases range with 1.6% (according to Tesla).
- There is no “maximum range” configuration for the Model X, only “maximum performance”. Model S has both.
- The fixed spoiler will potentially be difficult to clean from snow and ice, especially the rear window beneath the spoiler.
- The fixed spoiler might be too fragile for car washes with rotating brushes.
- With the spoiler recessed the car looks rather anonymous, which is a good thing when parking on the street.
- I think many 90D buyers would be prepared to pay extra for the option (me included), but would not accept the cost of a full P90D(L).