Air/Fuel Ratio Questions

running rich

I have had the car since last September and have 7K miles on it. It is driven 3000 to 5000 rpm 80% of the time and to 6000 rpm 20% of the time on the road, and between 4500 and 6250 on the track.

Rich is better than lean and the dealer service dept. tells me that this is a common complaint.
 
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