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The law of diminishing returns is obvious.
Someone asked me the other day what aero drag improvements I would recommend on a Tesla Model S.
I said: "None that I'd be confident with."
That was in the context of Rab Palin (Tesla aerodynamicist on the Model S) telling me he'd been having discussions with an aftermarket company developing Tesla Model S bits to - purportedly - reduce drag. Ones he said, that would not do so.
And hell, who would better know than he?
But still leaves us many billions of vehicles where it's easy to reduce drag (and/or lift)...
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