Rust reduces overall weight.
I am trying to look at things in a more... positive light. I mean a rusted out engine shelf with a few holes has got to weigh less than a nice crisp all metal one. Maybe I want to see parts of my muffler when I open my trunk. Metal conducts heat! My battery tray has less metalic mass than when new, therefore less heat is retained in my engine compartment, thus a cooler running engine. Now that I have a lighter car and it runs cooler, does that mean I go faster?
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