318 1/8 time improvement

Guess that settles that then. Out of curiosity where is C14 Race fuel made?

This stuff here:

VP C14 - Dominant Fuel in NHRA Championship Racing | VP Racing Fuels

Is that made in the US by any chance?

He's not running US made race fuel. He's on US made PUMP GAS.

And FWIW, I tune with race gas. No color on the plug. EVER. It's pig rich and a power loser.