Kilometer per liter to Miles per gallon (UK)
km/L
mpg
Conversion History
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Quick Reference Table (Kilometer per liter to Miles per gallon (UK))
| Kilometer per liter (km/L) | Miles per gallon (UK) (mpg) |
|---|---|
| 8 | 22.5984749024 |
| 10 | 28.248093628 |
| 12 | 33.89771235360000000136 |
| 15 | 42.37214044199999999788 |
| 17 | 48.02175916760000000192 |
| 20 | 56.496187256 |
| 25 | 70.62023407 |
About Kilometer per liter (km/L)
Kilometers per liter (km/L) is a fuel efficiency unit — higher is better — expressing how far a vehicle travels on each liter of fuel. It is the preferred fuel economy metric in Japan, India, Indonesia, and parts of Latin America. A typical economy car achieves 12–17 km/L; a petrol hybrid may exceed 20 km/L. The unit is the direct reciprocal of L/km and converts to L/100km by dividing 100 by the km/L value. Japanese fuel economy certificates (JC08 and WLTC test cycles) publish efficiency in km/L, making it the reference unit for vehicle purchasing decisions in Japan.
A Honda Fit achieves approximately 17 km/L on the Japanese WLTC cycle. A Toyota Prius hybrid reaches around 22 km/L under the same conditions.
About Miles per gallon (UK) (mpg)
Miles per gallon (imperial) — also written UK mpg — is the traditional British fuel economy unit, using the imperial gallon of 4.546 liters rather than the smaller US gallon (3.785 L). Because the imperial gallon is approximately 20% larger, UK mpg figures are roughly 20% higher than US mpg for the same vehicle: a car rated at 40 US mpg is approximately 48 UK mpg. The UK officially adopted L/100km for type-approval testing under EU harmonisation, but UK mpg remains prevalent in British automotive journalism, used-car listings, and consumer conversations in the United Kingdom and Ireland.
A typical family hatchback in the UK achieves 45–55 mpg (imperial) on the WLTP combined cycle. A 60 UK mpg rating equates to approximately 50 US mpg or 4.7 L/100km.
Kilometer per liter – Frequently Asked Questions
Why does India use km/L instead of L/100km?
India adopted km/L because it intuitively answers "how far can I go on one liter?" — a question that resonates strongly in a price-sensitive market where drivers often buy fuel in specific liter amounts rather than filling up. The Bureau of Energy Efficiency (BEE) publishes official star ratings in km/L.
How does India's fuel subsidy system interact with km/L ratings on car stickers?
India historically subsidised petrol and diesel prices, keeping pump costs artificially low and weakening the incentive to buy fuel-efficient cars. As subsidies have been rolled back since 2014, the BEE star rating in km/L has become a genuine purchasing factor. A one-star jump (roughly 3–4 km/L better) now translates to noticeable monthly savings, pushing buyers toward smaller engines, hybrids, and CNG vehicles.
What km/L does a 125cc motorcycle get in city traffic?
A typical 125cc commuter motorcycle in India or Southeast Asia achieves 40–60 km/L in city riding, far exceeding any passenger car. The Honda CB Shine, one of India's best-sellers, claims about 55 km/L — a major reason two-wheelers dominate Asian commuting.
Why do Japanese cars seem to have much better km/L than European cars?
Part of it is real — Japanese kei cars are lighter and smaller. But the old JC08 test cycle was also more lenient than European WLTP, inflating numbers by 10–20%. Japan has since adopted WLTC testing, narrowing the gap and giving more realistic km/L figures.
Is 20 km/L realistic for a non-hybrid petrol car?
It is achievable but only for small, lightweight cars under ideal highway conditions. In real-world mixed driving, most non-hybrid petrol cars top out around 15–17 km/L. Hitting 20 km/L consistently without hybrid assistance requires something like a sub-1000 kg car with a 1.0L engine.
Miles per gallon (UK) – Frequently Asked Questions
Why is UK mpg different from US mpg for the same car?
The imperial gallon (4.546 L) is 20.1% larger than the US gallon (3.785 L). So a car that travels 40 miles on a US gallon would travel 40 miles on less than one imperial gallon, yielding a higher UK mpg number. Same car, same fuel, different gallon definitions — endlessly confusing.
Is UK mpg still used now that Britain uses liters at the pump?
Yes, stubbornly so. British fuel is sold in liters and road signs show miles, but most Brits still discuss fuel economy in mpg (imperial). It is a quirky holdover — they buy liters, drive miles, and mentally calculate in a unit that directly matches neither.
How do I convert UK mpg to L/100km?
Divide 282.5 by the UK mpg value. So 50 UK mpg equals 282.5 ÷ 50 = 5.65 L/100km. For US mpg, divide 235.2 instead. These magic numbers are worth memorising if you cross-shop cars between markets.
Why did UK diesel car sales collapse after 2017 despite their higher mpg?
The Volkswagen emissions scandal (2015) shattered public trust in diesel. The UK government then announced clean-air zones charging diesel cars extra, raised vehicle excise duty on new diesels, and signalled a 2030 petrol/diesel ban. Residual values cratered, making diesel a bad financial bet despite 15–20% better mpg. Diesel's UK market share fell from 48% in 2015 to under 10% by 2023, replaced by hybrids and EVs.
Why do British car magazines show different mpg than the manufacturer claims?
Manufacturers quote official WLTP lab test results, while magazines run real-world tests with varying conditions. Magazine figures are usually 10–20% worse than WLTP because they include cold starts, traffic, motorway speeds above test assumptions, and actual British weather.