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so here is my question. When we financed our car it looks like they included the interest that we would be paying in the final price on the bill of sale

ie. cost of car 26,000 finance interest 2,500 Total bill 28,500.

Is this normal practice and if so our loan is open so we can make payments on it at anytime, are we able to get some of that interest charge back because we will have paid the car off sooner then the term and thus not borrowed the money as long?