In article <gpf7nh$6kp$1@news.motzarella.org>, "P J" <pj@pjama.invalid>
wrote:

> Shell is promoting its new nitrogenized gasoline as an engine cleaning
> formula. Anybody knows if this is for real and how nitrogen could
> accomplish that? I've been favoring Chevron for its techron content for
> the same reason.
> pj

I can't speak for the nitrogenized gasoline, but I started using Shell
several years ago, based on their cleaning claims. I discovered that
whatever it was, Shell gas was cheaper to run than other fuels.

I started with a few tanks of their Ultra, with extra cleaners, to get
things clean (this was a 94 Lexus with 130K miles on it). Then I
switched to their 87 octane, and ran nothing but that. I was getting
better mileage than I did on other fuels, and even accounting for the
fact that the Shell was a bit more expensive to buy, it was cheaper to
run.

go figure. I think their claims are legit--but they were so even before
claiming this "nitrogenized" fuel.