Specially these mods: F1_1986_1988_Historic_Edition_Tracks_3.1 (~3.5GB in Workshop / ~7.5GB on disk) Endurance Series rF2 build 4.10 (~1.8GB in Workshop / ~5.9GB on disk) I've checked the size that shows in the Workshop page against the size in the workshop/content/365960 folder.
But I guess they should be included in the size of the mod. I'm trying to figure out, and I also found that the Endurance Series mod has two version installed on my system (3.0 and 4.1), even though in the module manager it appears as only one version (4.1). Here's the space they take on the Installed folder: 5,9G ER_Endurance_Series_rF2/4.1 3,4G ER_Endurance_Series_rF2/3.00 9,2G ER_Endurance_Series_rF2/ I'm not implying there's something wrong but I'm trying to understand how it all fits together. My rFactor 2 folders take up 305GB and the corresponding workshop folder takes up 211GB because I have a lot of installed mods plus the official content.