I definitely recommend an underbody coating. My car has one from the factory or one of the previous owners, you can see it when you look underneath it's like a thick paint, and I'm certain that's why it has so little rust underneath. I'm considering redoing it ideally before this winter but more likely this upcoming spring just to fix a few spots that have chipped off over the years.
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Aiming for 50 MPG from an automatic.
See how I'm doing here, My Build Thread
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