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– Estimate the cost of the petrol used.
– Double this cost as recognition of the extra expenses in running a car.
– Divide by the number of occupants of the car (including the driver).
– This is the cost to be paid by each person.
(As an example, if petrol costs $30 and there is a driver and one passenger, then the cost to each is $30. In this case, the passenger, in effect, pays for all of the petrol and the driver pays the other costs. In the case of a driver and two passengers, the cost to each is $20, i.e. each passenger gives the driver an amount of $20.)
Any extra costs, such as road tolls, are shared equally between all occupants.