Fuel EconomyMiles per US Gallon to Liters per 100 Miles

Miles per US Gallon to Liters per 100 Miles

Methodology·How We Verify

Snapshot

1 Miles per US Gallon equals 378.541178 Liters per 100 Miles.

Reference basis: This conversion uses a fixed factor based on reference unit definitions.
Example: For 5 Miles per US Gallon, the result equals 75.708236 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.

378.541178 Liters per 100 Miles (L/100mi)

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API and AI agent access

Miles per US Gallon to Liters per 100 Miles.

Machine-readable identifiers

Conversion family: fuel-economy
Source unit: miles_per_us_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_us_gallon",
  "to": "liters_per_100_miles"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "fuel-economy",
    "value": 1,
    "from": "miles_per_us_gallon",
    "to": "liters_per_100_miles",
    "result": {
      "raw": 378.541177864,
      "display": "378.541178"
    },
    "canonicalPath": "/fuel-economy/miles-per-us-gallon-to-liters-per-100-miles/"
  }
}

API, OpenAPI and WebMCP documentation

Explanation

The converter converts miles per us 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 US Gallon page all use that same model.

Method & Reference

Method basis: exact conversion formula shown in Snapshot.
Applied factor: 1 Miles per US Gallon = 378.541178 Liters per 100 Miles.
Consistency rule: calculator output and table values use the same constants and rounding policy.

Common Conversion Values

Miles per US Gallon (mpg (US))	Liters per 100 Miles (L/100mi)
5	75.708236
10	37.854118
15	25.236079
20	18.927059
25	15.141647
30	12.618039
40	9.463529
50	7.570824
60	6.30902
80	4.731765

Questions & answers

Frequently Asked Questions

How is mpg (US) 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.