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I put in an aftermarket air intake and exhaust system onto my 2016 ATS and now I’m getting about 5mpg anytime I’m hitting the gas to accelerate. I’m not putting my foot down or anything like that and the turbo is producing around 5-8 psi of boost. I’m wondering if there might be an issue with the ECU or do I need to get a new tune? I commute about 20 miles to work everyday and average around 22-24 mpg for the trip which is about 80% on the highway.
 

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2002 F55 STS, 2014 Explorer XLT, F-150s
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Normal - any time you ask the engine to produce any more power than steady state cruise the instantaneous fuel mileage drops. Change the fuel averaging to a long-term logging value.

In your relatively flat area you probably don't see many mountain roads. Hit the big hills and watch instantaneous fuel mileage go from nearly 0 to over 65 as you go up and down.

The so-called "CAI" and exhaust most likely did nothing for fuel mileage or performance.
 
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