To estimate the distance traveled on one liter of petrol, you would need to know the fuel efficiency of the car, which is usually measured in kilometers per liter (km/L) or liters per 100 kilometers (L/100 km).
Assuming that you have the fuel efficiency of the car, you can use the following formula to estimate the distance traveled on one liter of petrol:
distance per liter = fuel efficiency
For example, if the fuel efficiency of the car is 15 km/L, then the distance traveled on one liter of petrol would be:
distance per liter = 15 km/L = 15 kilometers
Therefore, the estimated distance traveled on one liter of petrol by the car with an engine size of 2.5 liters would depend on its fuel efficiency, which you would need to know in order to make an accurate estimate.