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I am on the Auto-Fill program, how does an oil company know when to deliver my oil?
All oil companies use a 'degree day calculation' to estimate how much oil a customer has used. This can be done by hand or through the use of a computer program designed for the heating fuel industry. For an oil company to be able to do this you have to be an automatic-fill customer,  and the longer you are a customer the better the calculations become.