Doesn't sound like much of a difference, and with a starting price gap of about 10 grand between a base turbo-four and the entry-level V-6, you might think about saving a few bucks if a half second isn't a deal-breaker. You'll also save a few bucks at the pump. According to EPA figures, the four-cylinder nets 21/25/22 mpg city/highway/combined, while the twin-turbo-six gets you 18/23/20 mpg. That said, features editor Christian Seabaugh noted: "This 2.5-liter engine doesn't make much low-end power, and it gets coarse and grainy up high in its powerband."
Source : https://www.motortrend.com/cars/genesis/gv80/2021/2021-genesis-gv80-first-test-review/
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