Calculate car CO2 from fuel consumption

Calculate car CO2 from fuel consumption


CO2 emissions are very fashionable and today we explain how to calculate CO2 from consumption. Actually, it is not that CO2 emissions are in fashion now, but that they have always been present as this is one of the main greenhouse gas emissions.

Although the CO2 emissions announced by the manufacturers depend on the approved consumption, today we are going to tell you how you can calculate the real CO2 emissions of your car, based on the fuel consumption that you do on your daily trips or trips.

As you already know, a few days ago we published an article in which we told you how you can calculate gasoline that you have spent or are going to spend on a particular trip, so we recommend that you stop by, because it is a good base.

How to calculate CO2 from consumption

To carry out this calculation, we are going to base ourselves on the most common fuels, which are gasoline, diesel, LPG, Compressed Natural Gas and of course, electricity.

calculate CO2

CO2 emissions car gasoline

To calculate this it is necessary to know that a liter of gasoline that weighs about 750 grams, is composed of a 87% carbon, which is about 652 grams of carbon for each of the liters of gasoline in our tank.

To carry out the internal combustion of gasoline, an engine needs about 1740 grams of oxygen per liter. The 652 grams of fuel would have to be added to the 1740 grams of oxygen. This would result in 2392 grams of CO2 per liter of gasoline.

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If your gasoline car consumes an average of 6 liters per 100 kilometers, you would have to multiply those 2392 grams by the 6 liters and divide it by 100 km to find the CO2 generated per kilometer. A gasoline car that consumes 6 liters per 100 kilometers, emits an average of 14352 grams of CO2 per 100 km, which is about 143 grams of CO2 for each kilometer traveled.

Calculate CO2 diesel car

Unlike the lighter liter of gasoline, a liter of diesel weighs 835 grams. Diesel is made up of 86.2% carbon, which is 720 grams of carbon per liter of diesel.

To convert it into CO2, 1920 grams of oxygen are needed. If we carry out the same operation and add, we obtain 2640 grams of CO2 for each liter of diesel.

On a diesel that has a average consumption of about 5 liters per 100 km We would have that for every 100 km, this diesel car emits 13,200 grams of CO2, which has been about 132 grams of CO2 per kilometer traveled.

average CO2 emissions europe
Source | JATO

CO2 emissions from car LPG

To calculate this it is necessary to know that a liter of LPG weighs about 550 grams. LPG contains 82.5% carbon, which is 454 grams of carbon per liter. To consume this 1211 grams of oxygen are needed. In total we will have about 1665 grams of CO2 for each liter of LPG.

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In an LPG car that has a consumption of about 6 liters of LPG per 100 km we will have as a result emissions of 99 grams of CO2 per kilometer.

CNG car CO2 emissions

Unlike the rest, CNG is a gaseous fuel, in fact, there is little difference with the Natural Gas that your boiler burns, except that the one used by your car has been compressed to be stored in the tank.

As a general rule, consumption is measured in kg / 100km and there are several types of gas on the market classified by their low or high calorific value (L and H gas).

CO2 emissions per kg of H gas are higher than those of L gas. However, H gas contains more energy, so you will need less kg of gas per 100 km but emits slightly more CO2.

One kilogram of gas contains 61.4% carbon, or 614 grams of carbon. To burn this carbon, 1638 grams of oxygen are needed. The sum is 2252 grams of CO2 / kg gas.

With an average consumption of 4 kg of gas every 100 km we will emit about 90 g CO2 / km. In the case of gas with a high caloric content, we will talk about emissions of about 106 g CO2 / Km.

It should be emphasized that in addition to the CO2 emissions that by themselves are not harmful to humans, from the exhaust pipes of internal combustion vehicles, not only CO2 comes out, but other polluting gases, chemicals and particles that are associated with cardiovascular and respiratory diseases in high concentrations.

CO2 emissions electric car

The electric car is the only one with zero local CO2 emissions. The only way to calculate the CO2 that an electric car emits “virtually” is by checking the origin of the electrical energy.

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There are companies that guarantee the CO2 emission-free source of electricity supply so virtually an electric car can emit 0 grams of CO2 per kilometer. If you do not have energy from renewable sources, you should ask about the mix of renewable and nuclear energy to know the CO2 emissions per kW.

Once this is achieved, we should multiply that amount by the kW consumed per 100 km and later divide that figure by 100 to know the CO2 emissions for every kilometer of an electric car (Although they are not local emissions, they are still emissions that occur as a result of mileage, even if it is in another part of the country or the continent).

We have contacted Repsol, Cepsa and BP to see if they can offer us the data regarding the CO2 emissions generated in the production of the fuel, but we have been waiting for several days. In any case, in addition to the CO2 produced in the combustion of each of them, the CO2 generated in the production of these should be added.

Source | JATO, Ecoscore

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