They aren't checking specific gravity, they're checking dielectric constant, along with two (soon to be one?) reagent tests for oxygenates.
MTBE and Ethanol are oxidizing agents that will both cause the fuel to fail. In parts of New Mexico, where I live, fuel is only oxygenated November through February. In Colorado, where I often race, fuel is oxygenated year 'round.
Fuel is rarely tested at regionals in RMDiv.
FWIW.
ON EDIT: M Glassburner, I'm chief of tech this weekend for a N/N in Pueblo, Co. I'll take a bottle of un-oxygenated (AFAIK) NM pump super up there with me and test it. I'll also buy a few ounces of Colorado pump super, which I believe to be oxygenated, and test it. I'll bring the results back with me and post them, along with information, if it's on the pump, about what they may have added.
Ty Till
#16 ITS
Rocky Mountain Division
2007 RMDiv ITS champion
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