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I just redid my whole rear brakes and bearings on the TDI last weekend. Everything was seized in rust in there, I could barely turn the left drum by hand. Yet, I still did 60+ mpg on my last tank, which is not a small feat even for a properly running TDI.
It's early to tell how much mpg was affected, but my coasting distance has not significantly changed.
I don't think a small rub will change anything measurable.
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