+1 LSP sucks on tires...Actually, LSP is pretty hard on tires too. Any time you have exposed aggregate it chews up tires. Mix that with loose gravel and dirt and you have an even more pronounced effect.
PMS actually is pretty easy on tires. But that is course dependent. The last event there we saw very noticeable wear on the front tires. Primarily due to the slow tight sections which required lots of steering input followed by high slip angles. I'd say I lost about 20+ runs on those front tires, when in reality it was 12 very short runs. This is actually one of the reasons Madarash left the event. He knew the tire wear he would see.