Fuel Cost Calculator India 2026 | Petrol & Diesel Per Km

Fuel efficiency measured in km per liter (kmpl) or kilometers per liter. Example: Your car travels 500 km using 25 liters = 500 divided by 25 = 20 kmpl. Higher kmpl = more efficient = lower cost per km.

Hatchbacks: 18-22 kmpl. Sedans: 16-20 kmpl. SUVs: 12-16 kmpl. Bikes/scooters: 40-55 kmpl. Diesel vehicles: 20-30 percent better than petrol equivalent. Highway driving 15-20 percent better than city driving.

Check owner manual for manufacturer claims (usually optimistic). Better: Calculate real-world - fill tank completely, note odometer, drive normally, refill and note liters added. Distance divided by liters = Real efficiency. Repeat 5-10 times for accurate average.

Highway: Steady speed 60-80 kmph is optimal for engines. City: Stop-and-go traffic, frequent acceleration and braking, idling in traffic. Acceleration is most fuel-intensive action. Steady highway = 15-20 percent better efficiency than city.

Diesel is cheaper per km (30 percent lower) due to lower price and better efficiency. But diesel cars cost 2-4 lakh more. Breakeven: 5-6 years at 15,000 km annual usage. For less use, petrol is better. For high use, diesel saves significantly.

Maintain proper tire pressure (3-5 percent gain). Change air filter monthly (8 percent gain). Smooth driving without aggressive braking (15 percent gain). Regular oil changes (5 percent gain). Remove roof racks when not needed (2 percent gain). Together: 30 percent improvement possible.

YES, 10-15 percent worse efficiency with AC on. At city speeds: Avoid AC, use windows. At highway speeds 80+ kmph: Window drag becomes larger than AC load, so AC is fine. Best practice: Use AC only when necessary.

Formula: Fuel Price per liter divided by Fuel Efficiency (kmpl) = Cost per km. Example: 100 rupee per liter divided by 20 kmpl = 5 rupee per km. For 500 km trip: 500 multiplied by 5 = 2,500 rupees.

Scooters and bikes: 40-55 kmpl = cheapest per km (1-2 rupees). CNG vehicles: 20 km per 100 rupees = 1-2 rupees per km cheapest. Diesel cars: 3.5-4.5 rupees per km. Petrol cars: 5-6 rupees per km. Scooters and CNG most economical.

Prices standardized by government weekly. All pumps in same city have same price. Fuel quality may vary (reputable brands like Indian Oil, Bharat Petroleum generally best). Cheaper pump prices indicate short supply or old stocks. Brand trust matters more than price variations.