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Originally Posted by mbtoloczko
Its probably not quite like that. There is 13% more lift, but the throttle body butterflies are what control the amount of air that gets into the engine when you're just cruising around at part throttle. Its more likely that by changing the duration and the lobe centers, you've slightly decreased the efficiency of the engine at lower rpms, and so mileage is slightly reduced.
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Agreed! My guess it that it's also coupling with the Impreza fpr (i.e. rich AFR). Yet another reason to get on that MAF bypass, Chike 
-Bill
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