Anyone who owns a car knows gas prices are rising. The average cost of a gallon of regular unleaded gasoline nationwide has risen from $3.38 on July 1 to $3.54 on Aug. 2 to $3.73 on Aug. 27. But what most people don't know is that just as you should buy shorts in the fall and coats in the spring, there are financially smart times to fill up as well.
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