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Splitting a road trip on fuel alone is the usual convention, though the true cost per kilometre including depreciation, tyres and servicing is roughly double the fuel cost. Four people sharing a 340 km trip pay about a tenth of the equivalent train fare each.
Trip cost split
litres = distance x consumption / 100; per person = litres x price / people
Convention says the driver's contribution is the car and the driving. Splitting fuel between all occupants including the driver is the common compromise.
Including depreciation, insurance, tyres and servicing, typically two to three times the fuel cost alone.