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I once stopped at a gas station that was out of super (and subsequently mid-grade) and I put in regular. The car ran very poorly. I believe that a "knock" sensor becomes enabled and that retards the timing making the car run rich. The rich mixture would damage the catalytic converter. By the way, my mileage was terrrible also. As soon as I was down to half a tank, I filled up with super and after a brief while the car returned to normal. My car is 94 E320 so I imagine yours is the same set-up. The money you think you are saving will be wasted with the terrible mileage (due to the car sensing the detonantion of the low octane fuel and retarding the timing). Learn by my mishap - DON'T DO IT. In my case I was low on fuel so I was stuck, but next time I will out in just enought to get to the next station. It really ran poorly - No zip at all.
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