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

1 Miles per gallon (Imperial) = 0.832674 Miles per gallon (US) (mpg (Imp) → mpg (US)).

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

mpg(US) = mpg(Imp) ÷ 1.20095 Example: 40 mpg(Imp) ≈ 33.31 mpg(US)..

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

Realtime·fuel-economy·uk

Approx1/x

From

mpg (Imp)

1/x

Result

mpg (US)

0.832674

Precision [auto]

mpg(US) = mpg(Imp) ÷ 1.20095

Inverse: mpg(Imp) = mpg(US) × 1.20095

Worked example: 40 mpg(Imp) ≈ 33.31 mpg(US).

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

United Kingdom vehicle fuel economy ratings.

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

United States vehicle fuel economy ratings.

Miles per gallon (Imperial) (mpg (Imp))	Miles per gallon (US) (mpg (US))
10	8.3267
15	12.4901
20	16.6535
25	20.8169
30	24.9802
35	29.1436
40	33.307
45	37.4703
50	41.6337
55	45.7971
60	49.9605
70	58.2872
80	66.6139

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-imp&to=mpg-us

Embed this converter

<div data-convertnavi="mpg-imp->mpg-us"></div>
<script async src="https://convertnavi.com/embed.js"></script>