race gas or pump non ethanol premium, which to use

On the surface it looks like pump premium would suffice, but...

With your type of racing, do different track lengths come into play? How hard is the engine loaded out of the turns? Does that type of car run a locked out total for timing?

These things i'm not familiar with. You may need a little more octane then pump. Guessing you may be better doing a little mix at times depending on?