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by s_kanev 2276 days ago
Not OP, but I do (a fair amount of) HPDE/TT with an m240i, converted to the cup car spec.

Running costs for me are ~$500 / 2-hour day on 100-TW tires. These cars aren't exactly light, so they eat through consumables. Tires are the largest part, then repairs, then brakes. This doesn't count fuel.

If I had to guess for OP in PWC, 50-100% more, mostly driven by slick costs.

EDIT: added fuel note