In multiplayer with AI does accelerated tyre wear and fuel consumption also apply to AI cars? The other day I drove a race with friends and AI and none of the AI pitted. Maybe they drove harder compound which we didn't but can't be sure
I only race offline, but it has been my experience that the AI drivers do not suffer as much with changing tire and weather conditions the same way the player will. For this reason, I don't run in storm conditions as I cannot keep up with the AI who doesn't struggle for grip in the same way (light rain is still perfectly manageable). I also tend to be conservative on accelerating tire wear for the same reason - an overheated, worn set of slicks always seems to hurt me more than the AI drivers. With some exceptions, I've found the fuel multiplier to work pretty well with the AI for offline racing (so long as you don't eclipse ~3 hours of real-life race time).