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Heating oil is a major expense for many families in the United States. They can make sure that they pay the lowest price for oil by talking to several heating oil companies at the start of the heating oil Madison season. After they've done this for a few years, they start to see a pattern of which companies do better at finding lower-cost oil. It's critical that they know when to order oil, so that they don't run out. Many companies can install a monitor in the tank. It then sends a message to