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

Fuel Economy Converter

11 units available

Decimals:

From

To

664.436358

1 gal (UK)/100mi = 664.436358 mpg

Formula:

mpg = gal (UK)/100mi × 664.4363579866

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

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

2 gal (UK)/100mi to mpg 3 gal (UK)/100mi to mpg 4 gal (UK)/100mi to mpg 5 gal (UK)/100mi to mpg 6 gal (UK)/100mi to mpg 7 gal (UK)/100mi to mpg 8 gal (UK)/100mi to mpg

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

Gallon (UK)/100mi (gal (UK)/100mi)	Miles/Gallon (US) (mpg)
0.5	1,328.872716
1	664.436358
2	332.218179
5	132.887272
10	66.443636
15	44.295757
20	33.221818
25	26.577454
50	13.288727
100	6.644364
250	2.657745
500	1.328873
1000	0.664436

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

Miles/Gallon (US) (mpg)	Gallon (UK)/100mi (gal (UK)/100mi)
0.5	1,328.872716
1	664.436358
2	332.218179
5	132.887272
10	66.443636
15	44.295757
20	33.221818
25	26.577454
50	13.288727
100	6.644364
250	2.657745
500	1.328873
1000	0.664436

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.

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

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

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

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

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

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

Step-by-Step Example

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

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.

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.

Frequently Asked Questions

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

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

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

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

What is a Gallon (UK)/100mi?