Filled Mini Cooper w/ reg unleaded. Is that a problem? on 2002 Mini Cooper

I just noticed premium unleaded info. I only did it once

by in Lancaster, PA on June 20, 2013
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1 answer
ANSWER by , June 20, 2013
That's what i told my wife but she didn't believe me! Why do you think this might be a problem? Is premium fuel required or recommended in the owners manual, for the engine in your car?