# Mile Per Gallon (UK) Converters

> Convert miles per gallon (UK/Imperial) to and from MPG (US), L/100km, km/L, and other fuel economy units

**Category:** Conversion
**Keywords:** mpg, miles per gallon, UK, imperial, fuel economy, fuel efficiency, L/100km, km/L, convert
**URL:** https://complete.tools/mile-per-gallon-uk-converters

## How it calculates

Conversions use the UK Imperial gallon (4.54609 liters) as the reference. For direct conversions: 1 MPG (UK) = 0.832674 MPG (US), 1 MPG (UK) = 0.354006 km/L, and 1 MPG (UK) = 0.219969 miles/L. The conversion to liters per 100 km is inversely proportional: L/100km = 282.481 / MPG (UK). The tool first converts any input to MPG (UK) as an intermediate base, then converts to the target unit. This two-step process ensures accuracy across all unit combinations.

## Who should use this

- **UK and European drivers** comparing fuel economy ratings between vehicles sold in different markets
- **Fleet managers** standardizing fuel consumption data across international operations
- **Automotive journalists** converting manufacturer specifications for readers in different regions
- **Travelers** understanding rental car fuel efficiency when driving abroad

## Worked examples

Example 1: A UK car is rated at 45 MPG (UK). To find its US equivalent: 45 × 0.832674 = 37.47 MPG (US). Example 2: Converting 45 MPG (UK) to L/100km: 282.481 / 45 = 6.28 L/100km. Example 3: A European car rated at 5.5 L/100km converts to: 282.481 / 5.5 = 51.36 MPG (UK), or 51.36 × 0.832674 = 42.78 MPG (US).

## Limitations

This tool assumes standard fuel measurement conventions and does not account for differences in testing methodology between regions (such as WLTP vs EPA test cycles). Actual fuel economy may vary based on driving conditions, vehicle load, and environmental factors. The conversions are mathematically exact but real-world fuel economy figures often differ from rated specifications.

## FAQs

**Q:** Why are UK and US MPG values different?


**A:** The UK uses the Imperial gallon (4.546 liters), while the US uses the smaller US gallon (3.785 liters). This means the same distance traveled on the same amount of fuel produces a higher MPG number in the UK system.


**Q:** Which measurement is more commonly used worldwide?


**A:** Most countries outside the US and UK use liters per 100 kilometers (L/100km). This consumption-based metric is considered more intuitive because lower numbers indicate better efficiency.


**Q:** How do I compare cars rated in different systems?


**A:** Enter the fuel economy value in its native unit using the "From" dropdown, select your preferred unit in the "To" dropdown, and the tool handles all conversions automatically.


**Q:** Is the conversion exact?


**A:** The mathematical conversion is exact. However, official fuel economy ratings may differ between regions due to different testing protocols (WLTP in Europe vs EPA in the US).

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