yeah, that was my point about the lowering. it SHOULD be fractionally more aero... but aerodynamics can have strange quirks.There were reports of the MYP shipping without the spoiler last year and them limiting the top speed until it was installed so there must have been a reason for it.
Tesla Model Y Performance to be delivered without trunk spoiler due to parts shortage, top speed limited
Also remember that a lower suspension means lower wind resistance so there is some savings there.
Also, the spoiler... the reason for that would be that it’s needed to generate downforce at higher speeds (above the speed its limited to without the spoiler) to keep the rear wheels pressed down properly instead of lifting up and wandering a bit.
Downforce like that usually comes at a cost of aerodynamic efficiency. But... what the spoiler does at the lower speeds at which most driving is done could be pretty negligible either way. Or.. it may cost a few miles.