Fuel Economy Converter
Table of contents
What is fuel economy?Fuel economy conversionHow to use the fuel economy converterFAQsThis fuel economy converter enables you to quickly and easily swap between units used in fuel economy conversions. The units available in this MPG converter are:
- Miles per US gallon;
- Miles per UK gallon;
- Liters per 100 kilometers; and
- Kilometers per liter.
Keep in mind that these units are inversely proportional (that is, as one decreases, the other increases, and vice versa). An efficient car consumes a low amount of gasoline per 100 kilometers but can travel many miles on a gallon.
This fuel economy converter can serve as a useful tool when ordering a car from abroad. Ensure that you also have it with you when you are traveling in a country with different fuel economy units, as the differences between them are quite significant.
Keep reading to learn:
- What fuel economy is;
- The formulas used to convert different fuel economy units;
- How to manually convert mpg to liters per 100 kilometers;
- How to use Omni's fuel economy converter and much more.
Our gas calculator is closely related to these issues, as it lets you calculate the total cost of a car trip based on mileage, distance, and gas price.
What is fuel economy?
Fuel economy is the relationship between the distance a vehicle travels and the amount of fuel it consumes.
Consider two vehicles, vehicle A and vehicle B. If vehicle A uses 1 liter to travel 20 km and vehicle B uses 1.2 liters to travel the same distance, vehicle A has better fuel economy because it uses less fuel to travel the same distance as vehicle B.
Fuel economy conversion
When calculating, it's important to distinguish between the US and imperial gallon as they represent different values. US gallons are used mainly in the United States (unsurprisingly) but also in some Caribbean and Latin American countries. The imperial gallon is a unit you can encounter in some Commonwealth countries, such as the United Kingdom and Canada. Liters per 100 kilometers are used almost anywhere else on the planet.
Another important difference is between the measurement systems — when using miles (either imperial or US) per gallon, the higher the value, the more efficient the vehicle is. On the other hand, those using liters per 100 km usually hope for a lower score as it results in smaller gas bills.
1 liter per 100 kilometers equals 235.2 US MPG or 282.5 imperial MPG. At the same time, 1 US MPG equals 235.2 liters per 100 km. 1 US MPG = 1.201 UK MPG, while 1 UK MPG is 0.8327 US MPG. These are the basic equations of fuel economy conversion.
If you want to explore the topic further, check out our speed calculator, which deals with the trinity of time, distance, and speed, while the acceleration calculator deals with how velocity changes over time or how much a given force moves an object with a given mass.
How to use the fuel economy converter
The MPG converter is very intuitive. Enter the US miles per gallon into the first field, and the calculator will convert that figure to miles per UK gallon, liters per 100 kilometers, and kilometers per liter in real-time.
Alternatively, you can enter any number in a chosen field, and the MPG converter will immediately show its value in the other available units.
How can I improve fuel economy?
Here are some tips you could use for improving fuel economy:
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Drive at speeds around 60-65 mph (95-100 km/h). Cars consume fuel more efficiently at that speed.
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Keep your tires full of air at the recommended pressures.
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At speeds above 50 mph (80 km/h), it is highly recommended to close the windows and use the AC instead, as the wind increases resistance and makes the car consume more fuel.
What is a good fuel economy?
There are different ways to measure fuel economy.
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"The lower, the better" if we are using liters per 100 km (ℓ/100 km).
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"The higher, the better" if we use the English metric system (miles per gallon or mpg).
Famous car blogs indicate that anything less than 6 liters per 100 km is excellent. Omni Calculator's fuel economy conversion tool shows that 6 ℓ/100 km equals 39.2 US mpg.
How do I find out the fuel economy of my car?
Here is a practical method to calculate fuel economy:
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Fill your tank to the brim.
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Set the odometer to zero.
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Drive normally. The longer you drive, the better.
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Fill the tank to the brim again. The amount of fuel you put in the second time is the amount you consumed on your trip.
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Divide the miles you drove (as marked by the odometer) by the fuel you consumed in gallons. That's your fuel economy in mpg!
How to convert fuel economy from US mpg to liters per km?
Follow these steps to convert US mpg to liters per km:
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Make a note of your fuel economy in mpg.
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Divide 2.352 by your fuel economy in mpg.
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The result is your fuel economy expressed in liters per kilometer.
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If you want the fuel economy in liters per 100 kilometers, multiply the result of step 2 by 100.
How do I convert US mpg to UK mpg?
Converting US mpg to UK mpg is not at all difficult. Just follow these steps:
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First, get the formula:
1 US mpg = 1.201 UK mpg
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Get the value in US miles per gallon:
Say 12 US mpg
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Multiply that number by 1.2 to convert the value to UK mpg:
12 × 1.201 = 14.41 UK mpg
How much is 25 US mpg in km per litre?
10.629 km/L. Follow these steps to find the answer:
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Get the formula:
1 US mpg = 0.42514 km/L
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Get the US mpg that you wish to convert to liters per kilometer:
25 US mpg
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Multiply this value by 0.42514:
25 × 0.42514 = 10.629 km/L
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That's it! You have converted 25 US mpg to km per liter.