Fuel check is using a dielectric constant meter that has been zeroed against a standard such as Cyclohexane or Indolene. Typically Cyclohexane. IF it passes, ok....IF not, yer outa there regardless of what fuel you claim.That method of NHRA fuel check has been in place for many decades.
Now I heard that if you used some 1,4 dioxane.......well, that is another story. LOL
Regards,
HB2
Dissident