MisterMac
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The delivery trucks have multiple compartments, allowing them to carry many types of gas on the same truck. Also, in addition to the gasoline carried, drivers can add the petroleum brand's "additive package" as he fills the station tank(s). Just because it is on the same truck, there is still no guarantee you are getting the exact same gasoline once it is pumped.
It is when your wife is the delivery and sales coordinator for the local fuel supply company. It's the same fuel.