Fuel Cost & Trip Mileage Calculator
Estimate required petrol / diesel litres, total journey cost, and per-person carpool split.
Journey & Vehicle Parameters
For 350 km total distance
Complete Guide to Trip Fuel Consumption, Mileage Economics & Carpooling Split
Calculating your road trip fuel budget accurately prevents unexpected expenses during travel, road trips, and ridesharing commutes. Fuel expenditure depends on real-world vehicle mileage (km/L or MPG), payload weight, driving speeds, and terrain.
Mathematical Formulas & Conversions
Depending on your region, fuel economy is computed using metric (km/L, L/100km) or imperial (US MPG / UK MPG) metrics:
Fuel Volume (L) = Distance (km) / Efficiency (km/L)
L/100km Conversion = 100 / Efficiency (km/L)
Total Trip Cost = Fuel Volume × Price Per Litre
Carpool Split = Total Trip Cost / Number of Passengers
Speed & Aerodynamic Fuel Penalty
Aerodynamic drag increases with the square of speed. Driving at excessive highway speeds drastically inflates fuel consumption:
- • 80 km/h: Optimal efficiency baseline (100% economy)
- • 100 km/h: ~10% to 15% more fuel consumed
- • 120 km/h: ~25% to 30% more fuel consumed
- • Air Conditioner: Adds ~5% to 10% fuel load in city stop-and-go
Vehicle Fuel Economy & 500 km Journey Benchmark (Estimated)
| Vehicle Category | Average Mileage | Fuel Needed (500 km) | Est. Cost (₹100/L) | Cost per KM |
|---|---|---|---|---|
| Motorcycle (150cc) | 45 km/L | 11.1 L | ₹1,111 | ₹2.22 / km |
| Hatchback / Compact Sedan | 18 km/L | 27.8 L | ₹2,778 | ₹5.56 / km |
| Mid-size SUV / Crossover | 13 km/L | 38.5 L | ₹3,846 | ₹7.69 / km |
| Large SUV / 4x4 Truck | 9 km/L | 55.6 L | ₹5,556 | ₹11.11 / km |
Frequently Asked Questions (FAQ)
How can I measure my car's true real-world mileage?
Use the tank-to-tank method: Fill your tank to the auto-cut off and reset the trip meter to 0. Drive normally until the tank is half or quarter empty. Refill to auto-cut off and divide the trip meter distance (km) by the litres pumped.
How does US MPG convert to km per Litre (km/L)?
1 US Gallon is equal to 3.78541 Litres and 1 Mile is 1.60934 Kilometers. To convert US MPG to km/L, multiply the MPG figure by 0.425144 (e.g., 30 US MPG ≈ 12.75 km/L).
Should highway toll charges be added to the carpool split?
Yes, fair ridesharing etiquette splits both the total fuel cost and fastag/expressway toll charges equally among all passengers in the vehicle.