Fuel EconomyMiles per US Gallon to Miles per Imperial Gallon

Miles per US Gallon to Miles per Imperial Gallon

Methodology·How We Verify

Snapshot

1 Miles per US Gallon equals 1.20095 Miles per Imperial Gallon.

Reference basis: This conversion uses a fixed factor based on reference unit definitions.
Example: For 5 Miles per US Gallon, the result equals 6.00475 Miles per Imperial Gallon.

Interactive conversion

Converter Calculator

Decimals: 1.5 or 1,5. Fractions: 1/2. Scientific notation: 1e3. Write 1000 without grouping separators.

1.20095 Miles per Imperial Gallon (mpg (UK))

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API and AI agent access

Miles per US Gallon to Miles per Imperial Gallon.

Machine-readable identifiers

Conversion family: fuel-economy
Source unit: miles_per_us_gallon
Target unit: miles_per_imperial_gallon

Use these identifiers in the API request. Sources and model limits also apply to software clients.

Example API request and response

POST /api/v1/convert

Request

{
  "family": "fuel-economy",
  "value": 1,
  "from": "miles_per_us_gallon",
  "to": "miles_per_imperial_gallon"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "fuel-economy",
    "value": 1,
    "from": "miles_per_us_gallon",
    "to": "miles_per_imperial_gallon",
    "result": {
      "raw": 1.2009499258,
      "display": "1.20095"
    },
    "canonicalPath": "/fuel-economy/miles-per-us-gallon-to-miles-per-imperial-gallon/"
  }
}

API, OpenAPI and WebMCP documentation

Explanation

The converter converts miles per us gallon into miles per imperial gallon by normalizing the value through liters per 100 kilometers and then applying the exact US-gallon or imperial-gallon definition. That keeps mpg (US) and mpg (UK) on one fixed fuel-economy basis, so the direct answer, calculator, common values, and mirror Miles per Imperial Gallon to Miles per US Gallon page stay aligned.

Method & Reference

Method basis: exact conversion formula shown in Snapshot.
Applied factor: 1 Miles per US Gallon = 1.20095 Miles per Imperial Gallon.
Consistency rule: calculator output and table values use the same constants and rounding policy.

Common Conversion Values

Miles per US Gallon (mpg (US))	Miles per Imperial Gallon (mpg (UK))
5	6.00475
10	12.009499
15	18.014249
20	24.018999
25	30.023748
30	36.028498
40	48.037997
50	60.047496
60	72.056996
80	96.075994

Questions & answers

Frequently Asked Questions

How is mpg (US) to mpg (UK) calculated?

This page converts through liters per 100 kilometers and then applies the exact US-gallon or imperial-gallon definition, so mpg (US) and mpg (UK) stay on the same fixed fuel-economy basis.

Does this page use fixed fuel-economy standards only?

Yes. This cluster uses fixed metric, US, and UK fuel-economy standards only, with every route normalized through liters per 100 kilometers.