I'd be wary - chips are like 98% scams. No one has more advanced models and software for the engines than the OEM, and there are very good reasons that they program the ECU the way they do. I guarantee you the OEM is maximizing power and gas mileage with emissions regulations and reasonable reliability limits. If you change any of these factors, you are affecting all of them.
It is completely fair to feel that your desires from your car might not align with those of the market for which the car was built and tuned. Case in point - the Gamma turbo motor is the same as the one used in the Elantra GT Sport and others, and in those cars it is tuned to make 201hp vs the Kona's 175hp. And while you can absolutely change the tuning on your engine to focus on different priorities - more hp and less mpg, for example - its important to keep in mind that engine tuning is a very intensive and interconnected thing. You can absolutely squeeze more of something out of your motor, but it always comes as a tradeoff. Performance chip marketers that are telling you that you get more of everything (better mpg! more power! smoother ride! better reliability!), basically anything that sounds too good to be true, almost always is. OEM tuning is optimized.
I'm not discouraging modifying your tuning, just make sure you do a ton of research and testing before you fall victim to a scam.