I don't understand why the change in the first place. I have been in a number of organizations that have tried to keep gasoline to only gasoline, and the DC is the easiest way to do that. Not as easy as event gas. Event gas is the perfect answer. Instead of having ERC bring what they want, why doesn't SCTA specify certain legal fuels from their inventory and have them bring it.
Anything other than the old DC allows chemists
to make it expensive, time consuming and difficult to keep things under control.
Ok, so racer A goes much faster than the old, competitive record. You suspect his fuel might not be legal. Even if the DC is under 15, the tests for other compounds gets difficult in a hurry. Yes, there are portable gas chromatagraphs, that are laboratory quality, expensive to buy and use. Why open that can of worms in the first place?