I know that different gas stations have different additives than others such as shell vs mom and pop etc. So where does the additives get put in at? I work as a fuels person on a military base so our stuff is pretty bare bones. Our pumps do not have anything than inject as we are pumping and our bulk tanks have nothing either. Our trucks come in with a numbered seal for tampering purposes. We usually take what ever the truck has. Lets say the local Shell puts in a request for 2,000 gallons. Does the shell additives get injected where the truck loads the fuel? To the best of my knowledge all 87 fuel is the same and then BP, shell etc. makes it theirs by adding the additives. Is there a specific fuel loading spot for the local shell trucks to fill at? Usually additives are injected as the fuel is being received into the storage tank or it can be injected at the fill stand. I have been in the military fuel career field for 10 years mostly dealing with jet fuel but always wondered how the civilian gas stations worked.