Liters per km to Liters per 100 km
L/km
L/100km
Conversion History
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Quick Reference Table (Liters per km to Liters per 100 km)
| Liters per km (L/km) | Liters per 100 km (L/100km) |
|---|---|
| 0.04 | 4 |
| 0.06 | 6 |
| 0.07 | 7 |
| 0.08 | 8 |
| 0.1 | 10 |
| 0.12 | 12 |
| 0.15 | 15 |
About Liters per km (L/km)
Liters per kilometer (L/km) is the most granular metric fuel consumption unit, expressing the volume of fuel burned for every individual kilometer driven. Because a typical passenger car consumes only 0.04–0.15 L/km, the number is inconveniently small for everyday use, and most metric markets prefer L/10km or L/100km. L/km is used in engineering calculations, telematics data streams, and as the mathematical base for converting between metric consumption and efficiency units. It is the direct reciprocal of km/L: a car using 0.07 L/km travels approximately 14.3 km per liter.
A compact car rated at 7 L/100km consumes 0.07 L/km. A large SUV at 12 L/100km uses 0.12 L/km — visible as a small daily difference that compounds significantly over tens of thousands of kilometers.
About Liters per 100 km (L/100km)
Liters per 100 kilometers (L/100km) is the standard fuel consumption unit across the European Union, Australia, Canada, China, and most of the metric world. It expresses how many liters of fuel a vehicle burns to travel 100 km — a lower number indicates greater efficiency. Modern petrol passenger cars range from about 4 L/100km for efficient small cars to 15 L/100km or more for large SUVs and trucks. Because the unit measures consumption rather than efficiency, its relationship with km/L and mpg is non-linear: a change from 15 to 10 L/100km saves more fuel per kilometer than a change from 6 to 5 L/100km.
A Toyota Prius averages about 4.5 L/100km under EU testing. A full-size petrol SUV typically consumes 10–14 L/100km on the combined WLTP cycle.
Liters per km – Frequently Asked Questions
Why do engineers use L/km instead of L/100km?
L/km is the raw mathematical unit that telematics systems and engine control units log internally. It maps directly to instantaneous fuel flow divided by speed, making it ideal for real-time calculations. Multiplying by 100 to get L/100km is a display convenience for humans, not a computing necessity.
How do fleet telematics systems use L/km data to coach drivers in real time?
Modern telematics units sample fuel flow and GPS speed several times per second, computing instantaneous L/km continuously. When the value spikes — hard acceleration, excessive idling, speeding — the system triggers an in-cab alert or scores the behavior for later review. Over thousands of vehicles, coaching drivers to shave even 0.005 L/km off their average can save a fleet millions of liters per year.
What L/km does a Formula 1 car use during a race?
An F1 car burns roughly 0.35–0.45 L/km under race conditions, about five times more than a typical passenger car. FIA regulations cap total fuel at 110 kg per race, forcing teams to balance speed against consumption strategically.
Is 0.05 L/km considered fuel-efficient for a modern car?
Yes, 0.05 L/km (equivalent to 5 L/100km or ~47 US mpg) is quite efficient. Most petrol hybrids achieve this range. A non-hybrid petrol car would need to be a well-optimized compact to hit that mark consistently in mixed driving.
Why does my OBD scanner show fuel rate in L/km not L/100km?
OBD-II standardized on raw per-kilometer (or per-mile) metrics because the ECU calculates consumption at the granular level. Your dashboard or app multiplies by 100 for display. The raw L/km reading updates in real time and is more useful for diagnosing injector performance or driving behavior.
Liters per 100 km – Frequently Asked Questions
Does fuel consumption increase linearly with speed, or is there a sweet spot?
There is a sweet spot, typically between 50 and 80 km/h for most cars. Below that, the engine runs inefficiently at low load. Above it, aerodynamic drag — which scales with the square of speed — dominates. At 120 km/h a car may use 7 L/100km; at 160 km/h the same car could burn 11+ L/100km. That is why the jump from 100 to 130 km/h costs far more fuel than from 70 to 100.
What L/100km should I expect in real-world driving vs the WLTP sticker?
Most drivers see 10–25% higher consumption than the WLTP rating. A car rated at 6 L/100km will likely average 6.6–7.5 L/100km in mixed real-world conditions. Cold weather, city driving, roof boxes, and aggressive acceleration all push the number up.
How do I convert L/100km to US mpg in my head?
Divide 235 by the L/100km value. So 8 L/100km is roughly 235 ÷ 8 ≈ 29 mpg. For UK mpg, divide 282 instead. This mental shortcut is accurate enough for casual comparisons when shopping for cars across markets.
Why did Europe pick 100 km as the reference distance?
One hundred kilometers is a psychologically round number that keeps consumption figures in a convenient 3–20 range for most passenger cars. Using L/km would give tiny decimals (0.07), and L/1000km would give unwieldy large ones (70). The 100 km base hits the sweet spot for human readability.
What L/100km does a diesel car achieve compared to petrol?
Diesel engines are typically 15–25% more fuel-efficient than equivalent petrol engines. A petrol car rated at 7 L/100km might have a diesel counterpart at 5.5–6 L/100km. However, diesel fuel contains about 13% more energy per liter, so the CO₂ gap is smaller than the L/100km numbers suggest.