Liters per km to Gallons per 100 miles (US)
L/km
gal/100mi (US)
Conversion History
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Quick Reference Table (Liters per km to Gallons per 100 miles (US))
| Liters per km (L/km) | Gallons per 100 miles (US) (gal/100mi (US)) |
|---|---|
| 0.04 | 1,062.859268745 |
| 0.06 | 708.572845830000000000141714569166 |
| 0.07 | 607.348153568571428571610775874642 |
| 0.08 | 531.4296343725 |
| 0.1 | 425.143707498 |
| 0.12 | 354.286422914999999999858285430834 |
| 0.15 | 283.429138332000000000141714569166 |
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 Gallons per 100 miles (US) (gal/100mi (US))
Gallons per 100 miles (US) — abbreviated gal/100mi — is a consumption metric, the American analogue to the European L/100km standard. Lower is better. It is the mathematical inverse of US mpg multiplied by 100. The US EPA introduced the GPM metric alongside mpg to help consumers make better fuel economy comparisons: because mpg is non-linear, the true fuel saving from improving a 15 mpg truck to 20 mpg (1.67 gal/100mi saved) is far larger than improving a 40 mpg car to 50 mpg (0.5 gal/100mi saved). GPM makes this intuitively clear by expressing absolute consumption rather than efficiency.
A 25 mpg family sedan consumes 4 gal/100mi. A 50 mpg hybrid uses only 2 gal/100mi — saving as much fuel per mile as the difference from 10 to 50 mpg on a low-efficiency vehicle.
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.
Gallons per 100 miles (US) – Frequently Asked Questions
Why did the EPA start showing gallons per 100 miles on window stickers?
Research by Duke University professors showed that mpg systematically misleads consumers about fuel savings. The EPA added gal/100mi to Monroney stickers starting in 2013 to give buyers a linear, comparable number. A 1 gal/100mi difference always represents the same fuel saving regardless of starting point.
How does gal/100mi help compare plug-in hybrids that switch between fuel and electricity?
Plug-in hybrids complicate mpg because they drive some miles on electricity and some on petrol. Gal/100mi lets you weight the two modes transparently: if a PHEV uses 0 gallons for its first 40 electric miles and 2.5 gal/100mi after that, fleet managers can model exact fuel costs for any commute length. The EPA's MPGe tries to do something similar for consumers, but gal/100mi is more intuitive for mixed-mode budgeting.
What gal/100mi does the average American car use?
The average new car in the US uses about 3–4 gal/100mi (25–33 mpg). Full-size trucks sit around 5–7 gal/100mi, while hybrids achieve 1.5–2.5 gal/100mi. Electric vehicles show 0 gal/100mi but have a separate kWh/100mi rating.
Why do long-haul trucking companies obsess over fractions of a gal/100mi?
A Class 8 semi averages about 6.5 gal/100mi and covers 100,000+ miles per year — roughly 6,500 gallons annually. Shaving just 0.3 gal/100mi through aerodynamic fairings, low-rolling-resistance tires, or driver coaching saves ~300 gallons per truck per year. Across a 5,000-truck fleet, that is 1.5 million gallons saved — worth over $5 million at US diesel prices. At that scale, every tenth of a gal/100mi is a budget line item.
Why do Europeans never use gal/100mi even though they use L/100km?
Europeans adopted L/100km as their native metric from the start, so there was never a need for an alternative. Gal/100mi was invented specifically to fix the mpg illusion problem in the US. Europeans already had the "right" unit — they just used metric volumes and distances.