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These cars can really suck down the premium gas when you throttle them.
However
My mileage whent from 18.0 to 18.9 after break in. (2017 2SS M6)
I drive 50/50 freeway/streets, and most freeway is urban freeway. I know when you get out in the country that the mileage will increase.
This is not a gas mileage car, And I don't drive it like grandma.
Funny note; my 2016 Silverado gets 19.4 (and I don't drive that like grandma either).
Run a couple of tanks. Record miles and gallons and calculate. See if that jives with what the DIC shows.
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