from the manual
Fuel Flow Calibration
The accuracy of the fuel computer is affected by the value of Counts per .01 gals (K Factor). The Counts per .01 gals (K Factor) sets the calibration of the instrument to match the flow transducer and the variations in the installation. After running a tank of fuel use the following formula to adjust the accuracy.
The Counts per .01 gals (K Factor) is adjusted from the Fuel Flow/Computer page in Instrument Calibration. New Counts per .01 gals = (Old Counts per .01 gals) x (Disp GAL USED/PUMP GALS)
hope this helps
alan
n668g rv10