So if the GT was rated at say 10 mpg city, 16 mpg hwy, with the same engine performance, sales would be the same? I doubt it (I know I wouldn't have been interested). Fuel economy may not be at the top of the list of considerations for many GT buyers, but it is at least somewhere on the list for a good number (a few have even unashamedly entered their data on fuelly.com). There's a point at which some potential buyers will turn away. In this case, there is a hit on paper of more than 10% to city mpg. And, what happens if gasoline prices rise? Fuel economy is the number one consideration overall amongst all drivers, but the vast majority of them still don't buy subcompacts. Some people, me included, like to have a mixture of performance, comfort, utility, and economy. The Stinger GT provides such a combination. Maybe "the average person shopping for a RWD/AWD car with a twin-turbo" doesn't care but Kia thought they might and put in the Eco driving mode. It would be funny if Kia realizing their error would eliminate Eco for the 2020 model year.