Fuel Flow For Jets MSFS 2020 & MSFS 2024

I am using offsets 0x2020, 0x2120, 0x2220 & 0x2320 as a double (FLOAT64) to get fuel flow in lbs per hour.

When flying an aircraft such as the inibuilds Airbus A350 (engines 1 and 2) are about 55% of what the fuel flow is showing in the cockpit.

Offset<double> FSUIPCAltFuelFlow1 = new Offset<double>("FSUIPCAltFuelFlow1", 0x2020); //Alternate Fuel flow for engine 1 (Jets).
Offset<double> FSUIPCAltFuelFlow2 = new Offset<double>("FSUIPCAltFuelFlow2", 0x2120); //Alternate Fuel flow for engine 2 (Jets).
Offset<double> FSUIPCAltFuelFlow3 = new Offset<double>("FSUIPCAltFuelFlow3", 0x2220); //Alternate Fuel flow for engine 3 (Jets).
Offset<double> FSUIPCAltFuelFlow4 = new Offset<double>("FSUIPCAltFuelFlow4", 0x2320); //Alternate Fuel flow for engine 4 (Jets).

//Get alternate fuel flow.
doubleFuelFlow = FSUIPCAltFuelFlow1.Value + FSUIPCAltFuelFlow2.Value + FSUIPCAltFuelFlow3.Value + FSUIPCAltFuelFlow4.Value;

//Format fuel flow to remove decimals.
stringFuelFlow = doubleFuelFlow.ToString("f0");

What am I missing?

Thanks in advance,

Marc