Bad gas mileage

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Hey Folks how about some advice.
Ever since new our 2019 Kia Sorento 4 cylinder only gets around 15-20 mpg around town and highway maybe 25-27 mpg. Is that all these things get? Until recently we always ran Sunoco 93 octane I’m trying 91 octane now with no difference. Seriously it’s been like that since new so I don’t figure Kia injector cleaning will help. Please advise to I have a lemon or do all these Sorento’s get crummy gas mileage compared to many other cars. Thanks very much from Tony in Florida.