Depending on factors like traffic congestion, driving style, and other car-related issues, the real fuel consumption vary from what’s listed in the vehicle’s technical data sheet or dashboard display.

It’s never out of style to discuss strategies to cut back on fuel consumption. The internal combustion engine converts the chemical energy in the fuel to mechanical energy, which is then used to propel the vehicle.

There are a variety of losses that occur during the conversion process, which means that not all of the fuel’s energy is available as mechanical energy. As a result, engine efficiency is measured on a per-unit basis and fluctuates with operating conditions. Idling is an example of zero efficiency because fuel use does not result in any usable energy being generated from it.

## Displaying fuel consumption on the dashboard

Today’s cars come equipped with dashboard computers that display information such as our current fuel consumption. Instant and average, and most drivers tend to focus on the usage reported by the computer rather of the actual one. Is there a difference in the two?

Fuel usage is now displayed on the dashboard of virtually all vehicles. A useful tool that tells us when and how our automobile is travelling in the most effective manner possible.

In other words, if our average fuel consumption is high after a road with rapid acceleration and hard braking, we should know that the next time we use the same route, we should drive more slowly and carefully to reduce our fuel consumption.

### How does instant consumption work?

We can see how much fuel the automobile uses every second on the dashboard display. Depending on where you live, these indexes can vary greatly. In Europe, this is measured in liters per 100 kilometers, while in the United Kingdom and the United States, it is measured in mpg or miles per gallon.

Between 0 and 99 kilometers per gallon are displayed on the dashboard. A computer uses a variety of factors, including engine speed, fuel flow, intake manifold pressure, and throttle position, to calculate instantaneous consumption. Sensors and probes collect the data, which is then fed into a computer and shown on a screen within the vehicle.

There is also a calculation of the car’s average consumption, but the value on the display changes less frequently, either after a predetermined distance or a predetermined time.

### What does the computer not take into account when calculating average fuel consumption?

When computing usage, the computer neglects to account for the engine’s occasional overloads. For instance, you could switch on the air conditioner to cool the house off. There may be times when an automobile has to exert extra effort owing to friction with the air when it is moving slowly or at high speeds. Consumption rises in some instances, but the computer does not have to account for this.

### What is the difference from the real consumption?

The dashboard’s average consumption is always lower than the vehicle’s actual fuel use. As previously stated, the computer cannot account for all characteristics and circumstances while calculating the vehicle’s consumption display. The discrepancies, on the other hand, are not substantial. For example, a person who knows how much gas they use will notice a difference of roughly 1 2 liters in a full tank (0. 2 0. 5 gallons). In other words, according to the dashboard, the vehicle consumes around 0.2 liters every 100 kilometers.

### Fuel consumption on the dashboard display can be ‘tricked’

You may notice unusual readings on the dashboard display if a sensor that can measure temperature or gas flow or pressure is malfunctioning. Irrespective of its size,

## How to calculate the exact fuel consumption of your car

Please continue reading this post if you are one of the many people who do not know how to precisely assess the actual fuel consumption of their vehicle. To get an accurate answer, you’ll need to go at least several hundred kilometers or miles, therefore this calculation can only be performed when you’re preparing for a long trip.

- Although it is not important in the calculation of consumption, it is good to know what capacity your car tank has, to prepare the necessary money to make two full ones. This information is included in the technical manual of the car. Most cars have a fuel tank with a capacity of between 30 and 60 liters or between 8 and 15 gallons.
- The second step is to choose a gas station in which to fill the tank. Most pumps have a mechanism that will detect when the car tank is full. Try to fill the tank, then start the car and check if the fuel level is at the maximum.
- When you check that the fuel level is at maximum, write down on a paper how many liters (gallons) of fuel you have fueled and how many kilometers (miles) you have on the dashboard. These data must be as accurate as possible, for a result as close to reality as possible. If you forgot to read the number of liters (gallons) added from the pump, you can get this data from the receipt received from the gas station.
- Set the mileage odometer to zero when the gas tank is full. For most cars, this can be done by holding 2-3 seconds on a button on the clocks. To learn how to reset the mileage to zero, read the car manual. Do not forget this step because it is very important.
- Now is the time to go on a journey and drive as you usually do. Drive until the fuel level is neat the minimum limit, then stop at a gas station again.
- Now is the time to refill the tank, taking into account the steps described above. Note again on paper how many liters (gallons) of fuel you have fueled, how many kilometers (miles) you have traveled since you first fueled and get ready for a little math.
- The calculation is very simple. If at the second gas station you added “x” liters and between the first and second gas stations you traveled “y” kilometers, your consumption is (x * 100) / y. For example, if at the second gas station you supplied 35 liters and the distance between the two gas stations was 500 kilometers, your consumption is 7 liters / 100 kilometers – (35 * 100) / 500. The formula for converting this to mpg is 235.215/( L/100km) so 235.215/(7 L/100km) = 33.602 mpg.
- In other words, 35 liters of fuel mean 9.24 gallons the formula for converting liters of fuel to gallons si by dividing the number of liters by 3.785 (US gallons) and by dividing the number of liters by 4.546 (UK gallons)
- To know how many miles per gallon we have burned at a traveled distance of 500 km (310 miles) we should divide the number of miles, ie 310 miles, to the number of gallons, ie 9.24 gallons US and 7.69 UK the result will be 33.54 mpg US and 40.31 mpg in the UK

Fuel economy is a major concern for many drivers, therefore they experiment with various driving settings to reduce their use. Knowing how much gas your car uses each month will allow you to better plan your monthly spending. However, keep in mind that a car consumes differently in the city and on long highways.