Have you ever noticed that when you rent a car, assuming that you are renting in a class that leaves room for an upgrade, you’ll almost always be offered an upgrade of your reserved class for something paltry like $4 a day. If you plan for that upgrade when you make your reservation, that’s your chance to save some money! For example, I recently made a 5-day business trip to Tennessee with three other people. We knew we’d need a large car such as an SUV or Mini-Van to comfortably accommodate all of us, and our baggage, on the 4-hour…

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