Doing 80 mph for 8 hours with 2 adults, luggage, AC on, on the highway averaged me 34 mpg on our last roadtrip. It wasnt the hatch though it was the 2017 G4. I understand the sedan gets lower mpg?
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Congrats on the deal on your new GT, Premeir620!
I'm with the others - don't fret about your MPG just yet. It's going to be a little lower than your 2015 for sure, but it's too soon to say how much lower.
Check your tire pressure & alignment!