Probably a dumb question, not trying to stir-up $hit, but... why event fuel? Kind of makes things difficult trying to tune for those not living in No.Cal. were the ERC gas is readily available.
El Mirage, you go to impound and sample given. Or you could have your gas in tank tested before making runs and seal it.
Probably a good reason for this procedure but it sure makes it a little more difficult when you get to the track.
Chris