Added fuel efficiency unit (#703)

Author: aidbal

Common/UnitDefinitions/FuelEfficiency.json

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+{
+    "Name": "FuelEfficiency",
+    "BaseUnit": "LiterPer100Kilometers",
+    "XmlDoc": "Fuel efficiency is a form of thermal efficiency, meaning the ratio from effort to result of a process that converts chemical potential energy contained in a carrier (fuel) into kinetic energy or work. Fuel economy is stated as \"fuel consumption\" in liters per 100 kilometers (L/100 km). In countries using non-metric system, fuel economy is expressed in miles per gallon (mpg) (imperial galon or US galon).",
+    "XmlDocRemarks": "https://en.wikipedia.org/wiki/Fuel_efficiency",
+    "Units": [{
+        "SingularName": "LiterPer100Kilometers",
+        "PluralName": "LitersPer100Kilometers",
+        "FromUnitToBaseFunc": "x",
+        "FromBaseToUnitFunc": "x",
+        "Localization": [{
+          "Culture": "en-US",
+          "Abbreviations": [
+            "L/100km"
+          ]
+        }]
+      },
+      {
+        "SingularName": "MilePerUsGallon",
+        "PluralName": "MilesPerUsGallon",
+        "FromUnitToBaseFunc": "(100*3.785411784)/(1.609344*x)",
+        "FromBaseToUnitFunc": "(100*3.785411784)/(1.609344*x)",
+        "Localization": [{
+          "Culture": "en-US",
+          "Abbreviations": [
+            "mpg (U.S.)"
+          ]
+        }]
+      },
+      {
+        "SingularName": "MilePerUkGallon",
+        "PluralName": "MilesPerUkGallon",
+        "FromUnitToBaseFunc": "(100*4.54609188)/(1.609344*x)",
+        "FromBaseToUnitFunc": "(100*4.54609188)/(1.609344*x)",
+        "Localization": [{
+          "Culture": "en-US",
+          "Abbreviations": [
+            "mpg (imp.)"
+          ]
+        }]
+      },
+      {
+        "SingularName": "KilometerPerLiter",
+        "PluralName": "KilometersPerLiters",
+        "FromUnitToBaseFunc": "100/x",
+        "FromBaseToUnitFunc": "100/x",
+        "Localization": [{
+          "Culture": "en-US",
+          "Abbreviations": [
+            "km/L"
+          ]
+        }]
+      }
+    ]
+  }

UnitsNet.Tests/CustomCode/FuelEfficiencyTests.cs

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+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by \generate-code.bat.
+//
+//     Changes to this file will be lost when the code is regenerated.
+//     The build server regenerates the code before each build and a pre-build
+//     step will regenerate the code on each local build.
+//
+//     See https://github.com/angularsen/UnitsNet/wiki/Adding-a-New-Unit for how to add or edit units.
+//
+//     Add CustomCode\Quantities\MyQuantity.extra.cs files to add code to generated quantities.
+//     Add UnitDefinitions\MyQuantity.json and run generate-code.bat to generate new units or quantities.
+//
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+// Licensed under MIT No Attribution, see LICENSE file at the root.
+// Copyright 2013 Andreas Gullberg Larsen ([email protected]). Maintained at https://github.com/angularsen/UnitsNet.
+
+using System;
+
+namespace UnitsNet.Tests.CustomCode
+{
+    public class FuelEfficiencyTests : FuelEfficiencyTestsBase
+    {
+        // Override properties in base class here
+        protected override double KilometersPerLitersInOneLiterPer100Kilometers => 100;
+        protected override double LitersPer100KilometersInOneLiterPer100Kilometers => 1;
+        protected override double MilesPerUkGallonInOneLiterPer100Kilometers => 282.4809363;
+        protected override double MilesPerUsGallonInOneLiterPer100Kilometers => 235.2145833;
+    }
+}