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I've always thought that was true and although I've never actually measured it on any cars I've owned I believe it to have been absolutely true for an E39 540 I had and likely true for Z3 I had around the same time. R&T used to include exactly that comparison in their long term tests, 0-60 new and 0-60 at >40K miles, results were always different. idk if R&T still does that because I no longer subscribe to R&T, instead I take a sharpie and write 'R&T' in big letters on the cover of Car & Driver....turns out there's no difference.
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