I dunno, that DOES seem pretty low... I usually get gas mileage that low when I thrash on it. I'm running a pretty much stock s4 n/a, with a cat-less exhaust. Shortly after a rebuild I saw as high as about 27-28mpg, pure highway miles. I swapped to a different intake and now see low-mid 20s (likely because the AFM doesn't sit perfectly flat anymore; I need to fix that) and a bit under 20 on a normal tank of gas with a mix of freeway, around down, and hard driving mixed in.
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