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Well the first thing I think is the wheel covers can be improved. I have seen some claim that some of the other wheel covers meet or beat the Tesla aero covers so I think those need to be tried and documented.
Secondly the tire diameter is a 235 tire, I think it should be easy enough to try and go down to a 225 or 215 diameter tire to reduce that contact patch
Next I have seen a company called Performance Unplugged make some claims about increasing range with a front spoiler lip, lowering springs, and a rear spoiler. I have seen Bjorn Nyland however do a rudimentary test of the lip and the rear spoiler and it was negligible, but he didn't really do a thorough test. I think those should be tested more in depth.
A rear diffuser may have some benefit with this car. I have seen a report that was done on the aero performance and it seem to indicate that the Model 3 might benefit. However I would love to see some more feedback and data. Most people are putting these on for the appearance, and no one has really reported efficiency data or range info to go with the mod.
Rear wheel skirts I think would be beneficial on this car. However I don't see anyone doing anything that you can buy so it would probably need to be fabricated, but I think there would a real impact.
So that is what i am thinking at the moment. The method to coast in this car is appears to be a bit convoluted. I know there is a roll method that can be applied to the stopping method, but it still sounds like the car does a mild regen even if in rolling. I asked a few people who have the car if they knew if you could coast with the rolling, but I didn't get any feedback. Most of my driving is highway so I would love to be able to coast and have paddle to apply regen when I want it.
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