In order to even be near using the recommend trip fuel, and having enough to make it to the alternate airport I have to set fuel factor to P30. This seams really extreme. To be honest I've only tested as high as P30, and it's not enough to match Simbrief recommendations. With P30 I usually arrive somewhere between FINRES and ALTN fuel quantity recommendations. I'm not pausing, no assistance options are on. I'm using the iniBuilds provided Simbrief profile. For cruise profile I've used M80 and LRC, and didn't see much of a difference. I've tried cost indexes of 40, 60, 100. I set my cruise altitude no higher than the FMC recommendation.