Fuel Consumption (km/L)
Calculates average km/L from distance driven and liters refueled.
—
Fuel consumption in km/L: formula and benchmarks
Consumption is just distance driven divided by the fuel you burned to cover it: km/L = km_driven / liters_filled. Example: a car that did 450 km on 30 L comes out at 450/30 = 15 km/L, and a bigger number means a thriftier car. Want to check your own? Fill the tank until the pump clicks off, zero the trip odometer, drive the way you normally do until it's nearly empty, then top it up again and divide the kilometers on the trip meter by the liters you just put in.
Typical values and applications
Entry-level cars in Brazil run around 12–15 km/L on gasoline and drop to 8–11 km/L on ethanol, which makes sense since ethanol packs about 30% less energy per liter. Hybrids climb into the 18–25 km/L range, and electric cars, once you convert to an energy-equivalent figure, land somewhere around 60–100 km/L. The official numbers come from the Inmetro PBE Veicular labeling program. This is handy if you're a rideshare driver figuring out what fuel costs you every day, planning a highway trip, or trying to decide which flex-fuel option to pour in.
FAQ
Why does real consumption differ from the manual? The numbers in the brochure are measured on controlled test cycles. Out in the real world, traffic, the AC, soft tires, how much you're hauling and a heavy right foot can knock 10–25% off your km/L.
Highway or city, which is more efficient? Highway usually wins by 20–30%, because cruising at a steady speed skips the heavy fuel losses you get from constant stop-and-go.
How do I convert mpg to km/L? Take the U.S. mpg figure and multiply by 0.4251, so 30 mpg works out to about 12.75 km/L.
Does tire pressure really matter? It does. Tires running low on air create more rolling resistance, and that alone can cost you 3–5% in km/L.
Related Tools
Jet Fuel Burn Knots Liters Calculator
Computes total jet fuel burn in liters from average flow in kg per hour, ground speed in knots and route distance in nautical miles.
Fuel Consumption per Hectare
Calculate the fuel consumption per hectare of a mechanized operation, consumption = hourly consumption ÷ field capacity, dividing the tractor's hourly consumption (L/h) by the effective field capacity (ha/h). The result, in liters per hectare, is the practical indicator to budget the fuel cost of a farming operation and compare the energy efficiency of machines and settings. Heavy operations (subsoiling) consume far more L/ha than light ones (spraying). Combined with the diesel price and the total area, it gives the season's fuel cost. Enter the hourly consumption and the field capacity.
Fuel Savings Calculator
Compute trip cost and savings vs another vehicle (more/less efficient). Shows savings in $ and liters.
Heat Rate
Calculate the heat rate of a power plant, HR = 360000 ÷ η, dividing 360000 by the thermal efficiency in percent. The result, in kJ/kWh, is the fuel energy consumed to generate one kilowatt-hour of electricity — the inverse of efficiency expressed on an energy basis. It is the power-generation industry's standard metric: the lower the heat rate, the more efficient and economical the plant. A 40% efficiency equals 9000 kJ/kWh; modern combined-cycle plants reach ~6000 kJ/kWh. It lets you compare plants and estimate fuel use. Enter the thermal efficiency in percent.
Hybrid Vehicle Range by Mode
Estimates total hybrid range combining fuel and battery.
Aircraft Fuel Efficiency
Compute aircraft fuel efficiency = distance / fuel.
The results provided by this tool are for general informational and educational purposes only and do not constitute professional, financial, medical, legal, tax or accounting advice. Always confirm important decisions with a qualified professional and official sources.