The "right of every consumer" isn't in question-- I'm
literally supporting this idea by testing, which means I'm also skeptical, but pursuing my questions through a different avenue. I'm specifically saying the air around these discussions isn't very productive,
because it's rarely supported by data, while it's easy to dump skepticism everywhere and walk away. My limited testing shows a decrease, but it's slight enough to be negligible. If more people chime in, we can have a better discussion, beyond speculation.
What is this "allowed" and "rights" stuff about? You're not under persecution and have multiple posts in the thread, stop being so dramatic. I agreed with another person's opinion (
bxr140), then offered mine in tandem. If you want a specific test format to satisfy your skepticism, why not ask...or even do a mock-up spoiler to test some theory? Recommend some better testing parameters if you have them, and contribute something qualitative that will help to prove or disprove claims, with data-driven results. If you'd like, I can take measurements and send you what you need to get started.
As to my personal observation on aesthetics, the spoiler is both wider (nearly the entire trunk), extends off the rear lid by quite a bit more than the factory spoiler, tapers differently to the cars lines, and has more area. After holding both in-person, and seeing how they mount up at different points (factory is more recessed), I don't consider them identical, but to each their own. Based on preliminary reactions I've had to it, it's definitely more polarizing than the minimal lines of the factory performance spoiler (which is in-line with most factory equipment people see). My overall idea was that aerodynamic considerations usually don't serve form, as well as they do function, in many people's eyes. As to if this influenced Tesla? Who knows... I qualified my statement as personal opinion for that very reason.
I'm in agreement, you control for what you can, none of this is especially scientific. My conclusion was that over the course of the runs I did, it was consistently 2-3Wh/mi lower at highway speeds, real-world. I also stated that I wouldn't advise someone to purchase the spoiler, given these numbers, and took it further to say, I wouldn't advise it if they were twice as low... However, I'm one person and more testing is better and IMO necessary. A few others have posted better numbers and that could lead to a discussion about what they are doing differently and/or how they are testing. I'd also like to see if anyone is posting worse numbers (which I have yet to see).
Just to be clear, this isn't an attempt to justify a purchase and I'm not advocating for anything, other than more real-world information. I bought the spoiler out of curiosity and a desire for real-world results, since UP wasn't offering them, despite rather notable development (and racing) in other areas. I like it about as much as I like the factory spoiler, but it's actually easier to mount (and re-mount), so if it doesn't show more of an effect over time (or cumulatively), I can also get rid of it. The ultimate goal is to satisfy that curiosity, in line with some other things I intend to investigate (ride height and determining the effect of wheel width on the air curtain). There isn't much to mod on these cars, but aero is rather unique and interesting.