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Weight reduction in such small increments doesn't make sense if you're having to buy replacements. If there was a way to do the actual math, and I'm sure there is, it would show you that even replacing a ten dollar shift knob would never pay for itself in that car's life.
I would stick to removing the basics, and only replace any item you already need to replace with lighter materials.
In fact, I'd work on aero and driver habits before I would even bother with weight reduction, they will pay off quicker.
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