curl --request POST \
  --url https://api.iotools.cloud/v1/tool/fuel-economy-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "fuelEconomy": "30",
  "fuelEconomyUnit": "mpg_us",
  "currency": "$",
  "tripDistance": "500",
  "tripDistanceUnit": "km",
  "tripFuelEconomy": "8",
  "tripFuelEconomyUnit": "l100km",
  "tripFuelPrice": "1.50",
  "tripFuelPriceUnit": "liter",
  "compareVehicle1": "30",
  "compareVehicle1Unit": "mpg_us",
  "compareVehicle2": "45",
  "compareVehicle2Unit": "mpg_us",
  "compareDistance": "10000",
  "compareDistanceUnit": "km",
  "compareFuelPrice": "1.50",
  "annualMileage": "15000",
  "annualMileageUnit": "km",
  "annualFuelEconomy": "8",
  "annualFuelEconomyUnit": "l100km",
  "annualFuelPrice": "1.50",
  "annualFuelPriceUnit": "liter",
  "annualFuelType": "gasoline"
}
'

{
  "tool": "fuel-economy-calculator",
  "tool_version": "1.0.1",
  "outputs": {
    "conversionTable": [
      {
        "unit": "MPG (US)",
        "value": "30"
      },
      {
        "unit": "MPG (UK)",
        "value": "36.03"
      },
      {
        "unit": "L/100km",
        "value": "7.84"
      },
      {
        "unit": "km/L",
        "value": "12.75"
      }
    ],
    "tripTable": [
      {
        "metric": "Distance",
        "value": "500 km (310.69 miles)"
      },
      {
        "metric": "Fuel needed",
        "value": "40 L (10.57 US gal)"
      },
      {
        "metric": "Total cost",
        "value": "$60"
      },
      {
        "metric": "Cost per km",
        "value": "$0.12"
      },
      {
        "metric": "Cost per mile",
        "value": "$0.1931"
      }
    ],
    "compareTable": [
      {
        "metric": "Distance",
        "value": "10,000 km"
      },
      {
        "metric": "Vehicle 1",
        "value": "7.84 L/100km"
      },
      {
        "metric": "Vehicle 1 fuel",
        "value": "784.05 L"
      },
      {
        "metric": "Vehicle 1 cost",
        "value": "$1,176.07"
      },
      {
        "metric": "Vehicle 2",
        "value": "5.23 L/100km"
      },
      {
        "metric": "Vehicle 2 fuel",
        "value": "522.7 L"
      },
      {
        "metric": "Vehicle 2 cost",
        "value": "$784.05"
      },
      {
        "metric": "Result",
        "value": "Vehicle 2 saves $392.02 (33.3%)"
      }
    ],
    "annualTable": [
      {
        "metric": "Annual distance",
        "value": "15,000 km (9,320.59 miles)"
      },
      {
        "metric": "Fuel consumed",
        "value": "1,200 L (317.01 US gal)"
      },
      {
        "metric": "Annual cost",
        "value": "$1,800"
      },
      {
        "metric": "Monthly cost",
        "value": "$150"
      },
      {
        "metric": "Fuel type",
        "value": "Gasoline/Petrol"
      },
      {
        "metric": "CO₂ factor",
        "value": "2.31 kg/L"
      },
      {
        "metric": "Annual CO₂",
        "value": "2,772 kg (2.77 tonnes)"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}