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Fuel Monitoring in Telematics Guru

Telematics Guru can support some basic fuel monitoring functionality.

It should be noted that the overall reliability and usefulness of the data ultimately relies on the ability of any connected fuel sensor to provide accurate readings. 

Fuel in tanks sloshes about - and some sensors report readings regularly, without smoothing, which end up being all over the place and unreliable. 

Getting Fuel Data

Various sensors can be used to read and report fuel data, with DM devices and others, see:

Any given fuel sensor will read the sensor and report a "raw" value in it's Analogue Data field. 

To convert this into a useable/human readable number, we set up an analogue mapping - defaults are shown below.

Advanced Analogue Mappings

These are linear, i.e. for battery voltage, the devices report the value in terms of mV - so 4000 is reported, and we can convert to 4.0V in the display via the mapping above. 

Not all sensors operate in this way (though many do). For example, some fuel level sensors will measure the fuel depth in a tank. Some tanks may be narrower/wider in certain sections looking top to bottom. So to convert a sensor reading to a %, we need a non-linear analogue mappings. 

Advanced Analogue Mappings provides the ability to configure this. This can be used for any nonlinear analogues to provide a better estimate. This is not a requirement for all fuel sensing applications.


1. Create Advanced Analogue Mapping

  • Give the mapping a name
  • Select an asset type (all or a specific asset type)
  • Set the Min/Max X and Y values, showing the range.
    • X is the Sensor Reading (i.e. 200 = 200mV read by analogue sensor)
    • Y is the desired displayed value, i.e. 20% full. 

So for a tank level sensor which reads 1V when empty, and 5V when full, 

  • Min X = 1 (V)
  • Min Y = 0% (empty tank)
  • Max X = 5 (V)
  • Max Y = 100% (full tank)

2. Add the mapping values

You can then add various mapping values via the table provided or CSV. 

Some probe/tank manufacturers may provide this data. Otherwise, it can be calculated by taking readings at various tank levels and inputting.

3. Apply Mapping

When creating or editing an asset, add a new mapping

On the Create Screen, choose the "Advanced" option and select your previously created mapping.

When viewing your live or historic data, the advanced analogue mapping will be visible, if enabled above. 


Several reports can be used. 

  • Asset Analogue Value Report
    • This report will provide the current 'snapshot' of device analogue values. i.e. What is the current tank level across the fleet (or anything that is reported in the analogues)
  • Trip List (Diff) Report
    • This report can be customised to include the difference between Analogue Values (i.e. fuel level) at the start and end of trip.
    • This provides the fuel burn for the Trip.

Fuel Estimates

Telematics Guru can also estimate the fuel consumption per trip using pre-configured fuel consumption inputs. TG calculates the estimate based on the idle time and speed, over the total distance, per trip. This feature can only be enabled for Trip-Based assets. 

A linear approximation is used between the urban and suburban thresholds. This means, for example, with an urban fuel consumption of 10L/100km at 36km/h and a suburban fuel consumption of 5L/100km at 80km/h, at 58km/h, we're assuming a fuel consumption of 7.5L/100km.


1. Configure Fuel Consumption Estimates

  • Enable the Fuel Estimation.
  • The Idle, Urban and Suburban fuel consumption estimates are required.
  • These can generally be found in the vehicles user manual.

If the Fuel consumption for an asset is edited, the estimates will be changed for new data, only. Historic data will not be updated. 


  • Trip List Report
    • This report can be customised to include the Estimated Fuel Consupmtion per trip.

  • Trip List (Diff) Report
    • This report can also be customised to include the Estimated Fuel Consupmtion per trip, as above.

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