Fuel EconomyMiles per US Gallon to Miles per Imperial Gallon

Miles per US Gallon to Miles per Imperial Gallon

Snapshot

1 Miles per US Gallon equals 1.20095 Miles per Imperial Gallon. Conversion Encyclopedia uses the same fixed conversion basis across the calculator, common values, and reverse page for this page.

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.
Use the reverse page if you need the opposite direction with the same basis.

Use the interactive calculator below for custom values and the common-value table for quick checks.

Interactive conversion

Converter Calculator

1.20095 Miles per Imperial Gallon (mpg (UK))

Switch

Machine access

Available to apps and AI agents

Miles per US Gallon to Miles per Imperial Gallon can be requested through Conversion Encyclopedia's structured interfaces by software and compatible AI agents. The identifiers below select the same calculation as the calculator.

Machine-readable identifiers

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

The JSON API and OpenAPI specification use the identifiers to reach the conversion engine. WebMCP lets compatible AI agents request the same calculation.

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/"
  }
}

Full API 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.

For Miles per US Gallon to Miles per Imperial Gallon, this page keeps the same normalized fuel-economy model across the direct answer, calculator, and table.

The same normalized model drives quick checks and manual spot checks, so the displayed values stay consistent across the page.

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.

Is there a reverse page for mpg (UK) to mpg (US)?

Yes. Use the mirror mpg (UK) to mpg (US) page to apply the inverse relationship with the same fixed fuel-economy definitions.

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.