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).