Most people answer this question with a bus fare. That is the price of a ticket, not the cost of the journey. If you are driving — or thinking about sharing a car with someone who is — the number you actually want is the cost of moving one vehicle 380 kilometres down the M-2. It is easier to work out than you might expect, and once you have it, the case for sharing the car becomes obvious.
The three numbers that decide everything
A road trip's running cost comes down to distance, how far your car goes on a litre, and what that litre costs.
- Distance: Islamabad to Lahore on the M-2 is about 380 km.
- Fuel economy: a well-maintained 1300cc sedan cruising at motorway speed does roughly 12 km per litre. A small hatchback might manage 15; a large SUV might do 8.
- Petrol price: this moves constantly. The worked example below uses Rs 280 per litre — substitute today's figure and the method still holds.
The arithmetic
Fuel first. Divide the distance by your mileage to get litres burned, then multiply by the pump price:
| Fuel used | 380 km ÷ 12 km/l = 31.7 litres |
| Fuel cost | 31.7 l × Rs 280 = Rs 8,867 |
| M-2 motorway toll | Rs 1,500 |
| Total to move the car | Rs 10,367 |
That is the honest cost of the trip in one direction, and it is what a solo driver pays out of pocket every single time. Round trip, you are looking at just over Rs 20,000 before you have parked anywhere.
What changes when the car is full
Here is the part people underestimate. The car burns the same fuel and pays the same toll whether one person is in it or four. Every empty seat is pure waste — the cost has already been incurred.
Split that Rs 10,367 across three passenger seats and each seat costs about Rs 3,456. Nobody paid a premium and nobody made a profit. The bill for the journey was simply divided by the number of people taking it.
For the driver, the effect is dramatic: three filled seats cover the entire fuel and toll cost of a trip they were making anyway. The drive becomes free.
Why the mileage figure has to be verified
There is an obvious weak point in this method. The whole calculation hinges on that km-per-litre number, and it is the one input a driver could exaggerate to justify a higher price. Claim 8 km/l instead of 12 and the same journey suddenly "costs" Rs 14,800.
This is why Hopin does not accept a driver's word for it. During in-person verification we measure the vehicle's real fuel economy ourselves, and that observed figure — not the one on the application form — is what prices every ride that driver ever posts. It removes the incentive to inflate, because the number is not the driver's to set.
The costs this leaves out
To be straight about it: fuel and toll are the marginal cost of the trip. They are not the total cost of owning a car. Tyres wear, oil needs changing, the vehicle depreciates, and insurance has to be paid whether you drive to Lahore or not.
Hopin prices the marginal cost deliberately. The driver was already making this journey and already absorbing those ownership costs. Charging passengers for depreciation would turn a shared trip into a commercial fare — and at that point you have reinvented the intercity van, with the price to match.
Working out your own route
The method transfers to any trip. Take your distance, divide by your car's real mileage, multiply by today's petrol price, add any toll, then divide by the number of people travelling. That final number is what a seat is genuinely worth.
On Hopin the app does all of it for you, using the current petrol price and the driver's verified mileage — and drivers can only ever charge that amount or less, never more.
Hopin is Pakistan's intercity carpool — travel between cities with verified drivers and split only the fuel cost. Get the app on Google Play.