Capnavi introduced Mathematical + Fuel level monitoring solution:

compare to Fuel flow sensors - webfuel and lls-d combination:

fuel fillings and stolen amount of fuel registration

fuel consumption control is done with every 1 second fuel level measurement and compare (also detect the change of fuel as event)

Webfuel moduel is used and compatible with Vopamon,Fuelmetrix,Omnicomm,caplls and other systems.