My source was a chemist who worked for an oil company other than Shell. I had a long discussion with him following an oil seminar at the National in Salem. I asked about "nitrogen in the gas" and he explained that nitrogen was part of (some long sounding name with nitrous or nitric in it) which is a result of the refining process of gasoline, period.
I also know that gasoline is considered a fungible product - the additive package is introduced when the truck loads at the terminal. That doesn't mean that Shell has the same additive package as Uncle Joes Convenience Store. It also doesn't mean that one tanker truck of Brand X is identical to the next tanker truck of Brand X.
I also have decided that it is futile to try to believe and act upon marketing hype from anybody. Does one brand of soap get rid of ring around the collar better than washing your neck? Are $499 basketball shoes necessary so you can jump higher, run faster, and hit more three point shots? Have women smokers really come "a long way baby"?
You all have to decide what you want to believe.