I have the identical setup in 99 trim. When my car was at 8K I,d average about 290 to 325 K/40 liters. the type of driving is about 60% highway 40% city. My highway speed is usually around 120 - 140KPH. Take that sucker back to the dealer. This is my 4th G.T since 82 and they,ve always been in this range.
Good luck,
lewillie
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99/ Silver GT 4.6 SOHC
M.S. headers 3.27
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