How can we control fuel consumption for each vehicle against random consumption, from being lost and used for any other that not serve the company?

GOOD Fuel Optimization, and minimum the using of the unneeded accessories.

1-we can carry out a precise road test.

2-we can use the data from ecu of the truck if posible.

The modern diesel plant will at its near-optimal 65-70% loading, generate 3 kWh per litre but ensure engine operated by right RPM otherwise flue consumption  will be high.new type of tiers which shows you grade of fuel consipstion and using tracking software

The modern diesel plant will at its near-optimal 65-70% loading, generate 3 kWh per litre but ensure engine operated by right RPM otherwise flue consumption  will be high. 

One of the most efficient ways to control fuel consumption for vehicle against random consumption that not serve the company, is to track down all the movements of the vehicle by using a tracking software, and inform the drivers about good manners while driving a vehicle, this will have its own impact on saving the cost on fuel and environment.