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s5 N/A engines have no EGR (I am unsure about turbo as the only s5 turbo engine I have is nowhere near stock).
I find it hard to believe that the EGR is making a 25% fuel difference (maybe at idle).
Do you know your injector size and duration?
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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