Works out the fuel a trip needs from the distance and the fuel efficiency, then multiplies by the price. Tolls are added for a total, and the total is split between the people travelling.
This works out the fuel a trip needs from the distance and the efficiency, then multiplies by the price per litre.
Tolls are added for a total, and the total is divided between the people travelling.
Driving 400 km in a car managing 15 km/L needs litres, which at 175 a litre costs 4,667, or 11.7 per kilometre. Adding 5,000 of tolls brings the total to 9,667, which is 4,833 each between two people.
The same 400 km in a car managing 10 km/L takes 40 litres and costs 7,000. At 20 km/L it takes 20 litres and costs 3,500. Twice the efficiency is half the bill, and over 10,000 km a year that gap runs past 80,000.
Actual consumption typically runs 10 to 30% worse than the official rating. Traffic, air conditioning, a loaded car and hills all take their toll. Working out your own figure from the distance covered between two fill-ups gives a far more realistic estimate.
Only fuel and tolls are counted here. Parking, depreciation, insurance and tax are not.