Maybe you have to be a certain age to remember but when I was a kid, Shell had these commercials where they had two indentical cars with a beaker of gas on top of the carburetor (60s) and they'd fill one beaker with NEW SHELL, now with PLATFORMATE!! And the other with gas from some unworthy competitor. The Shell powered car would go a hundred yards or so further.

And ever since, they've charged more for their gas. That, and pollute the holy hell out of Nigeria.

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1986 300SDL, 362K
1984 300D, 138K