Originally Posted by AdrianM

You are correct in your opinion.

The CS (Control Standard) series are designed to run consistently for as many runs as possible. This is a huge advantage for a tire used for spec tire races.

The RP (Racing Physics) series are designed to be an all out racing tire. Fast lap times were a more important design criteria than tire life. RP tires are usually 1-2/10ths per lap faster than a similar compound CS tire.

Tire life - CS27

Stock or 19T : 6-10 runs before falling off
Open Mod: 4-6 runs

Tire life - RP30

Stock or 19T : 4-8 runs before falling off
Open Mod: 2-4 runs

The better you car setup the longer your tires will stay fast. Cars that are really working well slide less and this reduces tire wear.

The best traction compounds are:

CS tires:

Cold 0-75 deg F track surface : Paragon Ground Effects
Warm 65-120 deg F: 50/50 Mix of Paragon FXII and Trinity Tire Tweak
Hot 100-160 deg F: Tire Tweak

RP tires:

Cold 0-75 deg F track surface : Paragon Ground Effects
Warm 65-120 deg F: Hybrid Dip baked 20min with tire warmers
Hot 100-160 deg F: Hybrid Dip