Fuel Efficiency Calculator
Calculate vehicle or machine fuel efficiency and operating cost per km or per hour.
Calculator
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Fuel efficiency: 7.27 km/L
Cost per km: ₹13.06
Annual fuel cost: ₹11,91,953
Formula
Fuel efficiency (km/L) = Distance (km) / Fuel consumed (L). Cost per km = Fuel price (₹/L) / Efficiency (km/L). Annual fuel cost = Daily km × 365 × Cost per km.
Example calculation
Truck travels 400 km on 55 litres diesel at ₹95/litre: Efficiency = 400/55 ≈ 7.27 km/L. Cost per km = 95/7.27 ≈ ₹13.07/km. Annual cost at 250 km/day = 250 × 365 × 13.07 ≈ ₹11.93 lakh/year.
Engineering notes
For industrial equipment (excavators, cranes, DG sets), fuel consumption is expressed in litres per hour (L/hr) rather than km/L. Typical values: diesel generator 0.25–0.35 L/kWh, excavator 10–25 L/hr, truck crane 8–15 L/hr. Include fuel in project cost estimates when estimating site operating costs.
When to use this calculator
- Fleet cost management — calculate and compare per-km fuel cost across vehicles in a fleet
- Project costing — estimate diesel cost for equipment operated at a project site over the contract duration
- DG set operation — calculate fuel cost for a diesel generator at known load and run hours
- Route optimisation — quantify fuel savings from shorter or more efficient delivery routes
- EV vs diesel comparison — compare total fuel/energy cost of electric vs diesel commercial vehicles
Frequently asked questions
- What affects truck fuel efficiency on Indian roads?
- Key factors: (1) Load — running at 100% GVW typically gives best L/tonne-km efficiency. (2) Speed — highway fuel efficiency peaks at 60–70 km/h; above 80 km/h, aerodynamic drag increases consumption sharply. (3) Terrain — hilly routes increase consumption 30–50% vs flat roads. (4) Maintenance — under-inflated tyres increase consumption by 3–5% per 10 PSI below recommended. (5) Driver behaviour — aggressive acceleration and braking increase consumption 15–25%.
- How do I calculate fuel cost for a diesel generator?
- DG fuel consumption = Load (kW) × Specific fuel consumption (L/kWh). Typical SFC for modern diesel gensets: 0.28–0.35 L/kWh at 75% load. At full load, SFC may be 0.25–0.28 L/kWh. At low load (below 40%), SFC rises sharply. Example: 100 kW load on a 125 kVA genset (80 kW at 0.8 PF): consumption ≈ 100 × 0.30 = 30 L/hr at ₹95/L = ₹2,850/hr.
- How can I reduce fleet diesel consumption?
- Proven measures: driver training (5–15% saving), GPS route optimisation (5–10%), tyre pressure monitoring (3–5%), aerodynamic deflectors on trucks (3–8%), engine idling reduction policy (5–10% of fuel is wasted on idling), preventive maintenance on filters and injectors (2–5%). Combining all measures can reduce fleet fuel consumption by 15–25%, with payback typically under 1 year.