“That’s better than a Ford Expedition. An older one, anyway.”
I just made a round trip to Carmel, CA and back (about 250 miles) in a 2013 Avalanche. Computer said 18.9 mpg. But these cars are about as aerodynamic as a brick. The Corvettes have very low drag coefficients. You can see that when you are coasting to a stop. There just isn’t much drag.
My computer was reading 10 mpg and change. I checked using the old method and got 12.3.