Miles per Gallon (Imperial) to Liters per 100 miles Converter
To convert Miles per Gallon (Imperial) to Liters per 100 miles, use the formula L/100mi = 454.6091401 / mpg imp. For example, 25 Miles per Gallon (Imperial) equals 18.1843656 Liters per 100 miles. Enter a value above to calculate the result. You can also use the formula and reference table below.
Formula
L/100mi = 454.6091401 / mpg imp
Divide 454.6091401 by the positive Miles per Gallon (Imperial) value to get Liters per 100 miles. Fuel consumed per distance and distance travelled per fuel volume have a reciprocal relationship.
Example Conversions
1 Miles per Gallon (Imperial) (mpg-imp)
454.6091401 Liters per 100 miles (l-100mi)
5 Miles per Gallon (Imperial) (mpg-imp)
90.92182802 Liters per 100 miles (l-100mi)
10 Miles per Gallon (Imperial) (mpg-imp)
45.46091401 Liters per 100 miles (l-100mi)
25 Miles per Gallon (Imperial) (mpg-imp)
18.1843656 Liters per 100 miles (l-100mi)
100 Miles per Gallon (Imperial) (mpg-imp)
4.546091401 Liters per 100 miles (l-100mi)
Conversion Table
| Miles per Gallon (Imperial) (mpg-imp) | Liters per 100 miles (l-100mi) |
|---|---|
| 0.1 | 4546.091401 |
| 0.5 | 909.2182802 |
| 1 | 454.6091401 |
| 2 | 227.3045701 |
| 5 | 90.92182802 |
| 10 | 45.46091401 |
| 25 | 18.1843656 |
| 50 | 9.092182802 |
| 100 | 4.546091401 |
| 250 | 1.81843656 |
| 500 | 0.9092182802 |
| 1000 | 0.4546091401 |
How to Convert Manually
Use these steps to convert Miles per Gallon (Imperial) values to Liters per 100 miles without the calculator.
- Write down the value in Miles per Gallon (Imperial) (mpg-imp) that you want to convert.
- Apply the formula: L/100mi = 454.6091401 / mpg imp.
- For example, converting 10 Miles per Gallon (Imperial) gives 45.46091401 Liters per 100 miles.
- Label the result as Liters per 100 miles (l-100mi).
About Miles per Gallon (Imperial) and Liters per 100 miles
Miles per imperial gallon uses the larger UK gallon (4.54609 L), so the same car scores about 20% higher than in US mpg. UK car reviews and older Commonwealth figures use it. Liters per 100 miles mixes metric fuel volume with mile distances, a hybrid unit appearing in some North American EV and plug-in hybrid comparisons alongside gallons-per-100-miles figures. The two scales are related by the formula L/100mi = 454.6091401 / mpg imp. Miles per Gallon (Imperial) is used in UK car reviews and adverts and in comparing UK and US economy figures. Liters per 100 miles is used in EV and hybrid consumption comparisons.
Precision and Rounding:Fuel economy units are reciprocal of each other: consumption (L/100 km) falls as efficiency (mpg, km/L) rises, so conversions are formula-based, not simple factors, and small mpg differences matter more at low values than high ones. One decimal place is standard for window stickers and trip computers.
Fuel-economy results use exact volume and distance definitions with the reciprocal formulas shown on each page (reference).
Worked Example
15Miles per Gallon (Imperial) equals30.30727601Liters per 100 miles.
15 mpg-imp -> 30.30727601 l-100mi
FAQ
How do I convert Miles per Gallon (Imperial) to Liters per 100 miles?
Divide 454.6091401 by the positive Miles per Gallon (Imperial) value to get Liters per 100 miles. Fuel consumed per distance and distance travelled per fuel volume have a reciprocal relationship.
What is the formula for Miles per Gallon (Imperial) to Liters per 100 miles?
The formula is L/100mi = 454.6091401 / mpg imp.
How many Liters per 100 miles are in 1 Miles per Gallon (Imperial)?
1 Miles per Gallon (Imperial) equals 454.6091401 Liters per 100 miles.
Can I convert Liters per 100 miles back to Miles per Gallon (Imperial)?
Yes. 1 Liters per 100 miles equals 454.6091401 Miles per Gallon (Imperial), and the related converter can reverse the calculation.
What are common names for Miles per Gallon (Imperial) and Liters per 100 miles?
Miles per Gallon (Imperial) is shown as mpg-imp and may also be searched as mpg imp, imperial mpg, UK mpg. Liters per 100 miles is shown as l-100mi and may also be searched as L/100mi, liters per 100 miles.
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