Is gasoline a variable cost

Gasoline used to fuel an automobile would almost always be a variable cost because the quantity of gas used would vary with the usage of the auto.

In certain situations, you might find that gasoline was a fixed cost. For example, if you had a gas-powered generator that operated 24/7 to generate electricity to keep a remote radio tower powered, that would be a fixed cost because the amount of gas used would not fluctuate based on the usage of the tower to transmit communications.