ECM Software tuning for 2016.5 CX-5?

Hello MazdaManiacs, I am requesting any info from any technicians here or anybody that’s had their Mazda CX5 tuned. I’m considering getting my 2016.5 Mazda CX5 GT TECH. I absolutely love my Mazda, I would be curious to know if there’s any software tuning that can improve performance & gas mileage. Thank you in advance for any replies, ZOOMZOOM RULES 👌😁
 
Someone advised me to use an aftermarket ECU or a piggyback ECU to save more gas. But honestly, I don't understand it very well, so I don't dare do it.
 
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