Indeed. the price of gas is soaring.
I have a 1993 190 E. 4 cylinder/5 speed. Been using supreme unleaded (91)
for 3 years (since purchased).
Due to price spikes, I consider using 89 octane. or a blend or 91/89.
What's the effect of a lower octane rating for a few months....
I drive 200 miles a day r/t..

Let me know, please...

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THANK YOU. CONRAD