Gallons per 100 miles (UK) to Miles (US) per liter
gal/100mi (UK)
miles/L
Conversion History
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Quick Reference Table (Gallons per 100 miles (UK) to Miles (US) per liter)
| Gallons per 100 miles (UK) (gal/100mi (UK)) | Miles (US) per liter (miles/L) |
|---|---|
| 1.4 | 0.02457357226403650507 |
| 1.7 | 0.02983933774918718472 |
| 2 | 0.03510510323433786438 |
| 2.5 | 0.04388137904292233048 |
| 3 | 0.05265765485150679657 |
| 3.5 | 0.06143393066009126267 |
| 5 | 0.08776275808584466095 |
About Gallons per 100 miles (UK) (gal/100mi (UK))
Gallons per 100 miles (imperial) is the British consumption-oriented counterpart to the metric L/100km standard, expressing how many imperial gallons a vehicle burns over 100 miles. It is numerically distinct from its US equivalent because the imperial gallon (4.546 L) is larger than the US gallon (3.785 L), so UK gal/100mi values are roughly 20% lower than US gal/100mi for identical fuel consumption. The unit is used in UK engineering and fleet management contexts where consumption rather than efficiency framing is preferred, and in academic analysis of British vehicle fuel-use data.
A 50 UK mpg car consumes 2 gal/100mi (imperial). A typical British family SUV at 35 UK mpg uses about 2.86 gal/100mi (imperial).
About Miles (US) per liter (miles/L)
Miles (US) per liter is a hybrid unit combining the US statute mile with the metric liter. It does not correspond to any standard national fuel economy reporting system but appears in engineering calculations, conversion utilities, and contexts where US distance and metric volume data are mixed. One US mpg equals approximately 0.4251 miles per liter. The unit is most useful for intermediate steps when converting between L/100km and US mpg without requiring a full formula — a rough mental benchmark of 12 miles per liter corresponds to about 28 US mpg or 8.3 L/100km.
A car achieving 30 US mpg travels approximately 12.7 miles per liter. A 50 mpg hybrid covers about 21.2 miles per liter of fuel consumed.
Gallons per 100 miles (UK) – Frequently Asked Questions
Why would anyone use imperial gallons per 100 miles?
Fleet managers and logistics companies in the UK sometimes prefer this consumption-based metric because it scales linearly with cost. If fuel costs £5.50 per imperial gallon, a vehicle using 3 gal/100mi costs exactly £16.50 per 100 miles — much easier to budget than working backwards from mpg.
How does UK gal/100mi compare to US gal/100mi for the same car?
UK gal/100mi values are about 17% lower than US gal/100mi because the imperial gallon is larger. A car consuming 4 US gal/100mi uses only about 3.33 UK gal/100mi. Same fuel burned, but fewer of the bigger gallons needed to measure it.
How do UK fleet operators use gal/100mi to set carbon budgets per vehicle?
Burning one imperial gallon of diesel produces about 10.2 kg of CO₂. Multiplying gal/100mi by that emission factor gives a direct kg-CO₂-per-100-miles figure for each vehicle. Fleet managers set thresholds — say 25 kg CO₂/100mi — and flag any vehicle exceeding it for maintenance or driver retraining. The linear relationship makes gal/100mi far better than mpg for carbon accounting, where small absolute savings matter.
What is a good UK gal/100mi for a family car?
A modern family hatchback should achieve around 1.8–2.3 UK gal/100mi (43–56 UK mpg). Anything under 2 gal/100mi is considered very efficient. SUVs typically sit at 2.5–3.5 gal/100mi, and performance cars can exceed 4 gal/100mi.
Is this unit used on any official UK documentation?
Not on consumer-facing documents. UK vehicle registration (V5C) and type-approval certificates show L/100km and CO₂ g/km. Gal/100mi (imperial) lives mainly in fleet management software, academic transport research, and engineering reports where linear consumption comparisons matter more than the traditional mpg framing.
Miles (US) per liter – Frequently Asked Questions
When would I ever need miles per liter as a unit?
It comes up when you buy fuel in liters but measure distance in miles — common for Americans driving in Canada or Mexico, or British drivers who use miles but buy fuel priced per liter. It is also a useful intermediate step when converting between US mpg and L/100km.
How do I convert miles per liter to US mpg?
Multiply miles per liter by 3.785 (the number of liters in a US gallon). So 10 miles per liter equals 37.85 US mpg. For UK mpg, multiply by 4.546 instead.
Is miles per liter used officially in any country?
No country uses miles per liter as its official fuel economy standard. It is a cross-system hybrid that exists purely for convenience. Countries either use km/L (Japan, India), L/100km (EU, Australia), or mpg with their local gallon (US, UK).
What miles per liter does a typical American car get?
The average new US car achieves about 7–10 miles per liter (roughly 26–38 US mpg). A full-size pickup truck manages around 5–6 miles per liter, while a Toyota Prius hybrid pushes 15+ miles per liter.
Why is fuel in Canada sold in liters but distances shown in kilometers, not miles?
Canada fully adopted the metric system in the 1970s, so both fuel and distance are metric — Canadians use L/100km, not miles per liter. The miles-per-liter scenario mainly affects Americans crossing into Canada who still think in miles but face liter-priced pumps.