On the rich side compared to what? I haven't seen any normal injection cars with high compression running leaner than 14.7 at idle. Direct injection is a whole different animal. 11.5 or so at WOT fits with the way I understand the way you want to tune a NA car- dial in AFR for peak power, then add a touch of fuel back in to allow for temperature swings, fuel variations, etc. Also, fuel works to cool down the intake charge to some extent. You can also run a little closer to the edge with 93 vs 91 octane, so it also depends where you are.
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent
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