16. Pick up your loose change.
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This sounds a little weird, but hear us out. When you try to sell or trade your car at a dealership, they will do anything possible to lower the value of your car. Now, everyone has a few coins kicking around in the seats, but you should really pry them out regularly. The metal edges cause telltale signs of wear in small spaces. If you have trouble containing all of that money, leave a cup in a cup holder that is reserved for all of your loose change.