Fuel EconomyMiles per Imperial Gallon to Miles per US Gallon

Miles per Imperial Gallon to Miles per US Gallon

Snapshot

1 Miles per Imperial Gallon equals 0.832674 Miles per US 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 Imperial Gallon, the result equals 4.163371 Miles per US 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

0.832674 Miles per US Gallon (mpg (US))

Switch

Machine access

Available to apps and AI agents

Miles per Imperial Gallon to Miles per US 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_imperial_gallon
Target unit: miles_per_us_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_imperial_gallon",
  "to": "miles_per_us_gallon"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "fuel-economy",
    "value": 1,
    "from": "miles_per_imperial_gallon",
    "to": "miles_per_us_gallon",
    "result": {
      "raw": 0.832674184427,
      "display": "0.832674"
    },
    "canonicalPath": "/fuel-economy/miles-per-imperial-gallon-to-miles-per-us-gallon/"
  }
}

Full API documentation

Explanation

The converter converts miles per imperial gallon into miles per us 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 US Gallon to Miles per Imperial Gallon page stay aligned.

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

Common-value rows are generated from the same normalized fuel-economy model used by the live calculator.

Method & Reference

Method basis: exact conversion formula shown in Snapshot.
Applied factor: 1 Miles per Imperial Gallon = 0.832674 Miles per US Gallon.
Consistency rule: calculator output and table values use the same constants and rounding policy.

Common Conversion Values

Miles per Imperial Gallon (mpg (UK))	Miles per US Gallon (mpg (US))
5	4.163371
10	8.326742
15	12.490113
20	16.653484
25	20.816855
30	24.980226
40	33.306967
50	41.633709
60	49.960451
80	66.613935

Questions & answers

Frequently Asked Questions

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

Yes. Use the mirror mpg (US) to mpg (UK) 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.