mile per gallon (US)

{
  "id": "NISTu363",
  "unitsml_id": "u:mile_per_gallon",
  "name": "mile per gallon (US)",
  "names": [
    {
      "value": "mile per gallon (US)",
      "lang": "en"
    },
    {
      "value": "mile per gallon",
      "lang": "en"
    }
  ],
  "symbols": {
    "unicode": "mi/gal",
    "ascii": "mi/gal",
    "html": "mi/gal",
    "latex": "\\ensuremath{\\mathrm{mi/gal}}",
    "id": "mi/gal",
    "mathml": "<mrow><mi mathvariant='normal'>mi</mi></mrow><mo>/</mo><mrow><mi mathvariant='normal'>gal</mi></mrow>"
  },
  "identifiers": [
    {
      "type": "nist",
      "id": "NISTu363"
    },
    {
      "type": "unitsml",
      "id": "u:mile_per_gallon"
    }
  ],
  "references": [],
  "short": "mile_per_gallon",
  "root": false,
  "composite": true,
  "quantities": [
    {
      "id": "NISTq198",
      "name": "fuel efficiency",
      "type": "derived"
    }
  ],
  "dimension": {
    "id": "NISTd99",
    "name": "fuel efficiency",
    "expression": "L-2",
    "components": [
      {
        "key": "length",
        "symbol": "L",
        "power": -2
      }
    ],
    "dimensionless": false
  },
  "scale": {
    "id": "continuous_ratio",
    "name": "continuous ratio scale"
  },
  "systems": [
    {
      "id": "non-SI_not_acceptable",
      "name": "non-SI and not acceptable",
      "short": "nonsi-unacceptable",
      "acceptable": false
    }
  ],
  "root_units": [
    {
      "power": 1,
      "unit": {
        "id": "NISTu83",
        "name": "mile",
        "symbol": "mi"
      },
      "prefix": null
    },
    {
      "power": -1,
      "unit": {
        "id": "NISTu175",
        "name": "gallon (US)",
        "symbol": "gal (US)"
      },
      "prefix": null
    }
  ]
}