How to monitor and manage fuel consumption
Tracking your fuel efficiency is the most effective way to protect your profit margins and identify hidden vehicle faults.
To effectively manage fuel consumption, you must establish a baseline by calculating the Miles Per Gallon (MPG) for every vehicle in your fleet. The most actionable step you can take today is to begin recording your odometer reading and the amount of fuel purchased every time a vehicle is refilled. By dividing the miles driven by the gallons used, you create a clear metric that allows you to spot spikes in costs and identify which vehicles or routes are underperforming.
Setting up your tracking system
You do not need complex software to start. A simple spreadsheet can track the following data points for each vehicle:
- Date of refuel
- Odometer reading (total mileage)
- Litres/Gallons purchased
- Total cost
- Driver name
Once you have two consecutive fuel entries, subtract the previous odometer reading from the current one to find the distance travelled. Divide this distance by the fuel volume to find your MPG. If you measure in litres, remember to convert to gallons (1 gallon is approximately 4.54 litres) to get a standard MPG figure.
Analysing the data
Once you have a month of data, look for patterns. If a vehicle's MPG drops suddenly, it is often an early warning sign of a mechanical issue, such as dragging brakes, fuel leaks, or engine inefficiency. If one driver consistently achieves a lower MPG than others on similar routes, it may indicate a need for training in fuel-efficient driving techniques.
Keep in mind that external factors like heavy loads, cold weather, and hilly terrain will naturally lower your MPG. Always compare like-for-like where possible.
Identifying inefficient habits
Monitoring fuel consumption often reveals that driver behaviour is the biggest variable. Small changes in how a vehicle is handled can lead to significant savings over a year.
| Inefficient Habit | Efficient Alternative |
|---|---|
| Excessive idling (leaving the engine running) | Turn off the engine if stopped for more than a minute. |
| Harsh acceleration and late braking | Anticipate traffic flow and use smooth, progressive inputs. |
| Driving at high speeds | Maintain a steady, moderate speed (typically 50-56mph for HGVs). |
| Poor tyre pressure management | Check and maintain tyre pressures weekly. |
Review and repeat
Fuel management is not a one-off task. Set a monthly date to review your logs. Celebrate improvements with your team and investigate any vehicle that falls more than 10% below its expected efficiency. Consistent monitoring ensures that fuel costs remain a managed expense rather than an unpredictable drain on your business resources.
Created by hatch. • Updated on April 30, 2026