# 🌱 How to estimate CO₂ emissions for ICE vehicles

This tutorial explains how to configure the routing request to estimate **energy consumption** for Internal Combustion Engine (ICE) vehicles, and how to convert this energy into **CO₂ emissions**.

All source content below is preserved exactly as provided.

## 🔧 Required fields in the routing request

You need to define a "routingEnergyVehicleFeature" in the routing request:

Set the following 4 fields of the ICE vehicle:

* **dryWeight (kg)**
Note: includes 75kg of the driver’s estimated weight
* **auxConsumption (W)**
* **scx (m²)**
* **crr (kg/t)**


If necessary, you can also define the **payload (in kg)**. Default value is 0.

You also need to define these 2 parameters (which reflect a driving profile):

* **maxAccel (m/s²)**
* **maxDecel (m/s²)**
You can use default parameters **1.25** and **-1.25** respectively.


Finally set these other parameters to fixed values:

* **engineEfficiency**: depends of the type of fuel used by the engine: diesel, petrol, LPG
  * petrol & LPG: approximately **0.25**
  * diesel: approximately **0.3**
* **regenerativeBraking**: false
* **batCapacity**: 1000 (kWh)
Note: a non zero value needs to be defined but it does not affect the result.


## 📐 CO₂ emission conversion formula

The estimation of CO₂ emission in kg is the value of the **energyConsumption** field in the response multiplied by **G / K**, where:

**G** = the emission factor (kg CO₂ / L), depending on the fuel:

* petrol: approximately **2.31 kg/L**
* diesel: approximately **2.68 kg/L**
* LPG: approximately **1.66 kg/L**


(see *What is the Carbon Footprint of a Conventional Car? | D-Carbonize*)

**K** = the energy released by 1 liter of fuel (kWh/L):

* petrol: approximately **9 kWh/L**
* diesel: approximately **10 kWh/L**
* LPG: approximately **7 kWh/L**


Therefore, to convert the energy consumption (in kWh) **E** into CO₂ emissions (in kg):

* petrol: **2.31 / 9 = 0.256**
* diesel: **2.68 / 10 = 0.268**
* LPG: **1.66 / 7 = 0.237**


## 📦 Example request for a diesel car

### Request


```json
{
  "geoserver": "here",
  "routingMode": "MODE_VIAS",
  "outputLanguage": "fr",
  "destinations": [
    {
      "coordinateSat": {
        "lon": 2.243,
        "lat": 48.89661
      }
    },
    {
      "coordinateSat": {
        "lon": 2.649556640625001,
        "lat": 48.81703451637949
      }
    }
  ],
  "options": [
    "POLYLINE", "EVENT", "EVT_ENERGY_CONSUMPTION"
  ],
  "routingVehicleProfile": {
    "transportMode": "CAR",
    "routingEnergyVehicleFeature": {
      "dryWeight": 1000,
      "crr": 0.007,
      "scx": 0.7,
      "auxConsumption": 400,
      "payload": 150,
      "maxAccel": 1.25,
      "maxDecel": -1.25,
      "engineEfficiency": 0.3,
      "regenerativeBraking": false,
      "batCapacity": 1000
    }
  }
}
```

### Response


```json
"energyConsumption": 17.922892992408247
```

### CO₂ emission


```
→ CO2 emission = 17.922892992408247 * 0.268 = 4.8 kg
```

## 🚗 Typical physical values for ICE vehicle categories

Here are typical values of dryWeight (kg), SCx (m²), RRC (t/t) and Auxiliary consumption (W) for the following categories of ICE vehicles (source chatGPT):

### 1. City Cars

Dry Weight: 800 - 1,100 kg

SCx: 0.60 - 0.75 m²

RRC: 0.007 - 0.009 t/t

Auxiliary Consumption: 400 - 600 W

### 2. Compacts

Dry Weight: 1,100 - 1,400 kg

SCx: 0.70 - 0.85 m²

RRC: 0.008 - 0.010 t/t

Auxiliary Consumption: 500 - 800 W

### 3. Sedans

Dry Weight: 1,300 - 1,600 kg

SCx: 0.80 - 0.90 m²

RRC: 0.009 - 0.011 t/t

Auxiliary Consumption: 600 - 1,000 W

### 4. SUVs

Dry Weight: 1,500 - 2,200 kg

SCx: 0.85 - 1.00 m²

RRC: 0.010 - 0.012 t/t

Auxiliary Consumption: 700 - 1,200 W

### 5. MPVs / Family Cars

Dry Weight: 1,500 - 2,000 kg

SCx: 0.85 - 1.00 m²

RRC: 0.009 - 0.011 t/t

Auxiliary Consumption: 600 - 1,100 W

### 6. Pick-ups

Dry Weight: 1,800 - 2,500 kg

SCx: 1.00 - 1.20 m²

RRC: 0.011 - 0.013 t/t

Auxiliary Consumption: 800 - 1,500 W

### 7. Light Commercial Vehicle (LCV)

Dry weight: 1,900 – 2,400 kg

SCx: 0.9 – 1.1 m²

RRC: 0.009 – 0.011 t/t

Auxiliary consumption: 600 – 1,000 W

### 8. Trucks

#### a. 3.5-ton truck

Dry weight: 2,200 – 3,000 kg

SCx: 1.3 – 1.6 m²

RRC: 0.010 – 0.012 t/t

Auxiliary: 600 – 1,200 W

#### b. 7.5-ton truck

Dry weight: 3,500 – 5,000 kg

SCx: 1.6 – 2.0 m²

RRC: 0.011 – 0.013 t/t

Auxiliary: 800 – 1,500 W

#### c. 12-ton truck

Dry weight: 6,000 – 7,000 kg

SCx: 2.0 – 2.4 m²

RRC: 0.012 – 0.014 t/t

Auxiliary: 1,000 – 1,800 W

#### d. 28-ton truck

Dry weight: 10,000 – 12,000 kg

SCx: 2.5 – 3.0 m²

RRC: 0.013 – 0.015 t/t

Auxiliary: 1,500 – 2,500 W

#### e. 40-ton truck

Dry weight: 14,000 – 16,500 kg

SCx: 3.0 – 3.6 m²

RRC: 0.014 – 0.017 t/t

Auxiliary: 1,500 – 3,000+ W