Calibrating your fuel management with the Fuel Adjustment Coefficient

Like many machines even cars sometimes need to be calibrated.  

Fuel usage and MPG data are reported by vehicles by different methods depending on the technology used in their engines. The VHM tries to give you the most accurate information that it can some vehicles require a calibration value.

You'll notice that gasoline vehicles will use technology that provides a close calibration value.  Diesel vehicles don't implement the same sophisticated fuel management tools and so calibration values for diesel vehicles may be off by a larger percentage and calibration may not be linear as it is in gasoline powered vehicles.

In order to calibrate the system for your vehicle you'll need:

  1. Observed MPG:  this is what you believe your vehicles MPG is based on the evidence of your fuel receipts.  You can do this based on your intuitive knowledge of your vehicle's fuel economy (MPG) or through a more rigorous (and more accurate) test where you track the amount of fuel used over time and divide that into your vehicle's mileage over the same time period.
  2. Divide the observed MPG by the Fleet Genius reported MPG.  The result of that calculation is the Fuel Adjustment Coefficient.   
  3. Enter the Fuel Adjustment Coefficient into the vehicle detail panel.
  4. The system will adjust the MPG and Fuel Used to more accurately reflect the true fuel usage of your vehicle.

You can monitor this value over time and recalibrate as necessary.

NB:  Your fuel usage as calculated by the system will also change.  Fuel usage will be adjusted using the same value.





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