Fixed cost are sometimes variable cost and variable cost sometime fixed discuss

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To my understaning, fixed cost are somtime variable cost, this happens when the cost bescomes a mixed cost. A mixed cost is a cost that contains both fixed and variable.eg:the annual expenses of operating an automobile is a mixed cost, some of the expenses are fixed ( cost of purshacing the vehicle) and the other is variable( cost of gsa, oil) . The cost of purchasing the vehicle does not change in relation to annual miles cover by the vehicle, this is a fixed cost, on the other hand the cost of gas vary in relation to the miles covered my the vehicle. So the total cost of running a vehicle is mixed