Anything that frees up restrictions on the engine breathing (in or out) should only improve gas mileage. As long as you drive the same way you did before the mods, you should realize those benefits. If you're giving it more throttle than before, then obviously you will not see much (if any) improvement.
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2012 PW NISMO #0559 - GT Spec Brace Kit - Swift Springs - ARK TP & Invidia CBE K&N Intake - UpRev Tune - 15mm Z1 Spacers & Studs - StopTech Slotted Rotors & SS Lines - ZSpeed CMAK with Stage 2 Clutch and Lightweight Flywheel
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