@taattor It's actually pretty interesting how they wear differently. I'm gonna split them up, because there's a lot of data here.
C1
<WearRate value="0.02961" />
Obviously the rate at which the tire wears, lower is better.
<WearGrip numVertices="17">
<SplineElement x="0.0000" y="1.0000" />
<SplineElement x="0.0600" y="0.9975" />
<SplineElement x="0.1300" y="0.9963" />
<SplineElement x="0.1900" y="0.9954" />
<SplineElement x="0.2500" y="0.9944" />
<SplineElement x="0.3100" y="0.9935" />
<SplineElement x="0.3800" y="0.9925" />
<SplineElement x="0.4400" y="0.9916" />
<SplineElement x="0.5000" y="0.9906" />
<SplineElement x="0.5600" y="0.9897" />
<SplineElement x="0.6300" y="0.9862" />
<SplineElement x="0.6900" y="0.9807" />
<SplineElement x="0.7500" y="0.9712" />
<SplineElement x="0.8100" y="0.9577" />
<SplineElement x="0.8800" y="0.9402" />
<SplineElement x="0.9400" y="0.9187" />
<SplineElement x="1.0000" y="0.8772" />
</WearGrip>
You can see the C1 compound wears very linearly right until the 56% mark, then it starts hitting the cliff. This tire isn't used that often, but if you're at somewhere like Barcelona, this would be the hard compound. You'd definitely want to switch around 65% at the latest.