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    Miles/Gallon (US) to Gallon (UK)/100mi Converter

    Convert Miles/Gallon (US) (mpg) to Gallon (UK)/100mi (gal (UK)/100mi) instantly. Formula: gal (UK)/100mi = mpg × 664.4363579866.

    Fuel Economy Converter

    11 units available

    Decimals:
    664.436358

    1 mpg = 664.436358 gal (UK)/100mi

    Formula:

    gal (UK)/100mi = mpg × 664.4363579866

    With your value: 1 mpg = 664.43635799 gal (UK)/100mi

    Other Miles/Gallon (US) to Gallon (UK)/100mi conversions

    2 mpg to gal (UK)/100mi3 mpg to gal (UK)/100mi4 mpg to gal (UK)/100mi5 mpg to gal (UK)/100mi6 mpg to gal (UK)/100mi7 mpg to gal (UK)/100mi8 mpg to gal (UK)/100mi

    Miles/Gallon (US) to Gallon (UK)/100mi Conversion Table

    Miles/Gallon (US) (mpg)Gallon (UK)/100mi (gal (UK)/100mi)
    0.51,328.872716
    1664.436358
    2332.218179
    5132.887272
    1066.443636
    1544.295757
    2033.221818
    2526.577454
    5013.288727
    1006.644364
    2502.657745
    5001.328873
    10000.664436

    Gallon (UK)/100mi to Miles/Gallon (US) Conversion Table

    Gallon (UK)/100mi (gal (UK)/100mi)Miles/Gallon (US) (mpg)
    0.51,328.872716
    1664.436358
    2332.218179
    5132.887272
    1066.443636
    1544.295757
    2033.221818
    2526.577454
    5013.288727
    1006.644364
    2502.657745
    5001.328873
    10000.664436

    Where these values come from

    Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

    Miles/Gallon (US) (mpg)

    Fuel Economy

    Exact conversion

    Composite of a defined volume and a defined length. US and imperial gallons differ, so mpg figures are not interchangeable between them.

    Source: NIST Special Publication 811, Guide for the Use of the International System of Units

    National Institute of Standards and Technology (US) · Reviewed 2026-07-01

    Gallon (UK)/100mi (gal (UK)/100mi)

    Fuel Economy

    Exact conversion

    Composite of a defined volume and a defined length. US and imperial gallons differ, so mpg figures are not interchangeable between them.

    Source: NIST Special Publication 811, Guide for the Use of the International System of Units

    National Institute of Standards and Technology (US) · Reviewed 2026-07-01

    How to Convert Miles/Gallon (US) to Gallon (UK)/100mi

    This conversion uses an offset formula, so it cannot be described by a single multiplication factor.

    Formula: gal (UK)/100mi = mpg × 664.4363579866

    Reverse: mpg = gal (UK)/100mi × 664.4363579866

    Step-by-Step Example

    1. Start with your value in Miles/Gallon (US). For example: 5 mpg
    2. Apply gal (UK)/100mi = mpg × 664.4363579866
    3. The result is: 132.887272 gal (UK)/100mi

    About Miles/Gallon (US)

    Miles per gallon (mpg) is the standard measure of fuel economy in the United States.

    Common uses: car window stickers, fuel costs, environmental metrics.

    About Gallon (UK)/100mi

    The gallon (uk)/100mi (gal (UK)/100mi) is a unit of fuel economy. The gallon (uk)/100mi scale is offset from the kilometre per litre scale, so converting it requires both a factor and an offset rather than a single multiplier. UnitConvertLab converts it against every other fuel economy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

    Common uses: fuel economy calculations, engineering and science, education.

    Frequently Asked Questions

    How many Gallon (UK)/100mi are in 1 Miles/Gallon (US)?

    There are exactly 664.4363579866 Gallon (UK)/100mi in 1 Miles/Gallon (US).

    What is the formula to convert Miles/Gallon (US) to Gallon (UK)/100mi?

    The formula to convert Miles/Gallon (US) to Gallon (UK)/100mi is: gal (UK)/100mi = mpg × 664.4363579866. For example, to convert 10 Miles/Gallon (US) to Gallon (UK)/100mi, you would apply the formula to 10.

    What is a Miles/Gallon (US)?

    Miles per gallon (mpg) is the standard measure of fuel economy in the United States.

    What is a Gallon (UK)/100mi?

    The gallon (uk)/100mi (gal (UK)/100mi) is a unit of fuel economy. The gallon (uk)/100mi scale is offset from the kilometre per litre scale, so converting it requires both a factor and an offset rather than a single multiplier. UnitConvertLab converts it against every other fuel economy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

    What are the common uses of Miles/Gallon (US)?

    The Miles/Gallon (US) is commonly used in car window stickers, fuel costs, environmental metrics.

    Related Fuel Economy Conversions

    Kilometer/Liter → Gallon (UK)/100miLiter/100km → Gallon (UK)/100miMiles/Gallon (US) → Kilometer/LiterMiles/Gallon (US) → Liter/100kmMiles/Gallon (US) → Miles/Gallon (UK)Miles/Gallon (US) → Mile/LiterMiles/Gallon (US) → Gallon (US)/100miMiles/Gallon (US) → Kilometer/Gallon (US)Miles/Gallon (US) → Kilometer/Gallon (UK)

    Cite this page

    UnitConvertLab. (2026). Miles/Gallon (US) to Gallon (UK)/100mi converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/mpg_us-to-gallon_per_100mi_uk