Calculating Car Mileage: How To Calculate Car’s Mileage?

Published: 09/14/22 •  5 min read

If you find yourself in a situation where you need to know about your car’s mileage, then look no further, this is all about calculating car mileage.

With the rising fuel cost across the globe, drivers are constantly trying to get as much mileage out of their cars as possible. We often choose cars that claim to offer the most efficient fuel efficiency over their rivals. It is the most crucial element when it comes down to smaller hatchbacks and entry-level sedans.

However, we do not consider what factors affect how much “real on-road mileage” of any car. They could be the vehicle’s condition, the style of driving, the state of traffic and roads, the fuel quality, etc.

Modern vehicles also display real-time mileage information on their multi-functional displays. However, if you have an older car that does not have similar instrumentation, how will you know the current mileage?

Dashboard Displays Fuel Consumption

Calculating Car Mileage

Today’s cars have dashboard computers that, among other things, show us how much fuel we have. The computer shows both the actual and average consumption. Most drivers will consider this the actual fuel consumption.

Nearly all cars have an indicator displaying current or average fuel consumption. This useful function allows you to see when your car is driving most efficiently. It reveals how much fuel your car uses in a given second. These indices will vary depending on where you live. This is done in Europe with 100km/liters, while in the USA and UK with miles per gallon or mpg. However, there are different quantities calculated for each area.

The dashboard shows values between 0 and 100 km. 99 liters are for 100 km. A computer calculates instantaneous consumption by taking into account multiple values such as engine speed and fuel flow, pressure in the intake manifold, throttle position, and pressure in the intake manifold. Sensors and probes read these values, and then the computer displays the value in the car’s cabin.

Sometimes, the engine can experience overloads not taken into account by the computer when it calculates consumption—turning on the air conditioner, for example. If the car moves slowly or at high speeds, it must exert more effort.

It is, therefore, essential to determine the exact amount of mileage your car can give on the roads. It is also possible to calculate the average car consumption. Here, we will provide you with a primary and effective method of calculating the “actual on-road” mileage of your vehicle.

Real Fuel Consumption Vs. Actual Fuel Consumption

The dashboard shows an average consumption lower than the actual fuel consumption. Because the dashboard displays the average consumption, the computer can’t consider all variables and parameters. The differences between the actual consumption and calculated consumption aren’t substantial. A person who can calculate the actual consumption of the car in a full tank will see that the difference is approximately 1-2 liters (0.2-2 gallons). The dashboard displays the car’s consumption at 0.2 liters/100 km.

How To Calculate Car’s Mileage?

The most efficient method of calculating the mileage of your car is by using a technique known as the ‘tankful to tankful method. It can take a while but reduces error by a significant amount. It’s pretty simple, and here’s the way to accomplish it:

Top-Up Your Fuel Tank

Top up your car’s fuel tank up to capacity and designate a dispenser. The majority of dispensers have auto-cut-off features when the fuel level is at the top of the tank. Make sure to stop here and not add more.

Reset The Meter

Set the trip meter on the vehicle to zero. It will help you determine the mileage in a better way.

Follow The Speed Limit

We all enjoy driving fast at times, but the faster a vehicle is driven, the more fuel is consumed. So, make sure you don’t exceed the speed limit.

Drive Around

We suggest a minimum of 250-300 km before filling up again. It may take several days; however, depending on how much gas you use and the more fuel you use, the more you will

refill to provide you with a rough estimate.

Fill Up Fuel Tank Again

Make a trip to the same fuel pump to refill the tank of fuel for your car. Once the dispenser reaches the auto cut-off point and ceases, don’t refill it again. Take note of what amount of fuel is injected.

Calculate the mileage of your car

It’s not rocket science but simple math!

Calculate your car’s mileage by dividing the kilometers you traveled according to the trip meter divided by the fuel consumed.

How to Calculate Car’s Mileage with Formula?

Car mileage = No. of Kms/Quantity of Fuel Utilized

Repeat this process a few times to get an understanding of it. It is a lot of fun during long drives on open roads, where the mileage increases considerably. Check it out and share your experiences, as well as the actual mileage you are receiving.

Bottom line

Suppose we discover that our average fuel consumption is high after driving on the road with aggressive accelerations or braking. In that case, it is a good idea to slow down and be more careful if we are concerned about our car’s fuel consumption.

If you believe your car’s mileage has declined significantly, it could be the perfect moment to sell it. The impact of mileage-related issues can be detrimental to the value of resales for your car, and the repairs could cost you thousands of dollars.