Ive fixed the sky in my foggy prato mini mod if anybody wants to try it.
back up your original sky_001.png first and then rename to sky_001.png and put in prato textures folder and enter the following into your fog.ini
Ive also noticed that if a track has scenery texture wrap like the distant hills on mugello fog is not applied so it sticks out and doesnt look real, tracks like faulkenburg and prato are uneffected as they have no distant scenery. This does not effect fva which uses the same fog file but with an extra line at the end which doesnt do anything (as far as I can tell) which is why Ive set it to 0.000 in my fog file. (prob a placeholder)