Okay I am sure that the wrong program here is the load manager for the 737 NG.When I completely UNload the 737NG, I get a ZFW of some 17k, but the freeware 737 fuel planner available on AVSIM has the base empty ZFW of the NG at 91k."Okay", I thought, may as well put this to the test.So I start FS9 and load the empty NG and use the FMC and -- whalaa -- 91k.Is there a reason why the load manager has the wrong weights? For the longest time I was calculating my fuel based on the load manager's weight readouts and always wondered why in the heck I kept getting "insufficient fuel" messages in my FMC when i thought I was calculating fuel correctly. Now I finally know why.From now on I will rely only on my fuel planner from AVSIM, but I would like to know if there is a way to edit the cfg for the load manager to get the correct weights.Thanks,Chris

I corrected the issue.Somehow a line got changed in my CFG file. I matched numbers and found the issue and manually made the weights all correct as per the Boeing web site.Now everything matches what the FMC expects in FS.Chris

Chris,I don

Aye I found out what happened. It was my fault entirely as I was apparently reading the wrong bloody line in the manager. Least to say I am slightly embarrassed now at this. LOL. I need to quit trying to fly after i have worked 12 hour shifts and am so tired.