Additives are added at the fuel terminal, not the refinery or pipeline. You aren't located at the end of the civilized world as am I.
Maybe I mis-spoke. But yeah, wherever U go to get the gas from storage tanks to the trucks. I worked for HESS for a bunch of years running a station before Military. I got to do fun things like stick tanks, stick the truck, insure loads, amounts, deliveries along with all the MX needed to be called in, and Gas Jockey, etc., was in NJ and NJ law U R not allowed to pump yer fuel, must be "attendant". Friggin gas truck driver one day freaked me out and taught me a thing about trucks and fuel: He got on top of fully loaded truck, and dropped lit match, nothing, still here. BUT he
reiterated in the strongest words, not a thing to do on an empty truck, as those
"fumes" blow U to the moon, I remember that lesson, and that was like 1972, LOL.