Fuel EconomyMiles per Imperial Gallon to Liters per 100 Miles

Miles per Imperial Gallon to Liters per 100 Miles

Methodology·How We Verify

Snapshot

1 Miles per Imperial Gallon equals 454.608999 Liters per 100 Miles.

Reference basis: This conversion uses a fixed factor based on reference unit definitions.
Example: For 5 Miles per Imperial Gallon, the result equals 90.9218 Liters per 100 Miles.

Interactive conversion

Converter Calculator

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

454.608999 Liters per 100 Miles (L/100mi)

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API and AI agent access

Miles per Imperial Gallon to Liters per 100 Miles.

Machine-readable identifiers

Conversion family: fuel-economy
Source unit: miles_per_imperial_gallon
Target unit: liters_per_100_miles

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_imperial_gallon",
  "to": "liters_per_100_miles"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "fuel-economy",
    "value": 1,
    "from": "miles_per_imperial_gallon",
    "to": "liters_per_100_miles",
    "result": {
      "raw": 454.608999466,
      "display": "454.608999"
    },
    "canonicalPath": "/fuel-economy/miles-per-imperial-gallon-to-liters-per-100-miles/"
  }
}

API, OpenAPI and WebMCP documentation

Explanation

The converter converts miles per imperial gallon into liters per 100 miles by normalizing the input through liters per 100 kilometers, then restating the result in the target fuel-economy format. Because one side measures consumption and the other measures efficiency, the numeric behavior is inverse even though the route stays on one fixed shared basis. The calculator, common values, and mirror Liters per 100 Miles to Miles per Imperial Gallon page all use that same model.

Method & Reference

Method basis: exact conversion formula shown in Snapshot.
Applied factor: 1 Miles per Imperial Gallon = 454.608999 Liters per 100 Miles.
Consistency rule: calculator output and table values use the same constants and rounding policy.

Common Conversion Values

Miles per Imperial Gallon (mpg (UK))	Liters per 100 Miles (L/100mi)
5	90.9218
10	45.4609
15	30.307267
20	22.73045
25	18.18436
30	15.153633
40	11.365225
50	9.09218
60	7.576817
80	5.682612

Questions & answers

Frequently Asked Questions

How is mpg (UK) to L/100mi calculated?

This page converts through liters per 100 kilometers, which keeps consumption-format and efficiency-format fuel economy units on one fixed shared basis even though their numeric behavior is inverse.

Why do consumption and efficiency values move in opposite directions?

Consumption units measure fuel used per distance, while efficiency units measure distance per fuel amount. That is why improving efficiency lowers one number while raising the other.