Comments by "Mikko Rantalainen" (@MikkoRantalainen) on "" video.

I would say the tire compound doesn't affect the AWD system if the tire radius is the same. The system is probably designed to have front and rear wheels rotating at the same speed while driving straight. If rear and front wheels have different sizes, the center diff will be active all the time (or in cars where haldex replaces the center diff, the haldex discs are slipping all the time) which will introduce extra heat and wear. If your center diff if torsen type, it could be damaged by the heat, too. The different tire compound should affect the rear and front tires wearing at different speeds and causing different radius forcing the center diff to always be active.
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@piti_rocks Without center diff or clutch slip the average rotation speed of front wheels and average rotation speed of rear wheels will be fighting against each other. And without clutch or center diff, the only way is to slip at least one wheel or snap a transmission part.
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If the Haldex replaces the center diff, yes, you'll be getting extra tire wear. Also make sure to have every tire with equal wear and equal air pressure or you'll be soon having equal wear in all tires.
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