What is 1 Miles per gallon (US) in Miles per gallon (Imperial)?

1 Miles per gallon (US) = 1.2009 Miles per gallon (Imperial) (mpg (US) → mpg (Imp)).

What is the formula to convert Miles per gallon (US) to Miles per gallon (Imperial)?

mpg(Imp) = mpg(US) × 1.20095 Example: 30 mpg(US) ≈ 36.03 mpg(Imp)..

No — the factor is approximate to engineering precision. The page surfaces an "Approx" badge whenever the relationship is not defined exactly.

Convert miles per gallon (us) to miles per gallon (imperial) instantly. The conversion factor is approximate to engineering precision.

Realtime·fuel-economy·us

Approx1/x

From

mpg (US)

1/x

Result

mpg (Imp)

1.2009

Precision [auto]

mpg(Imp) = mpg(US) × 1.20095

Inverse: mpg(US) = mpg(Imp) ÷ 1.20095

Worked example: 30 mpg(US) ≈ 36.03 mpg(Imp).

Miles per gallon (US) (mpg (US))

United States vehicle fuel economy ratings.

Miles per gallon (Imperial) (mpg (Imp))

United Kingdom vehicle fuel economy ratings.

Miles per gallon (US) (mpg (US))	Miles per gallon (Imperial) (mpg (Imp))
10	12.0095
15	18.0142
20	24.019
25	30.0237
30	36.0285
35	42.0332
40	48.038
45	54.0427
50	60.0475
55	66.0522
60	72.057
70	84.0665
80	96.076

Want a downloadable CSV? Append ?format=csv to the API /api/v1/table endpoint.

GET https://convertnavi.com/api/v1/convert?value=10&from=mpg-us&to=mpg-imp

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