It's all very curious. The online owner manuals for C7 Stingray in both US and Europe all say the same thing about AFM,
Europe
2015 - “With a manual gearbox, the system is only active in EcoMode.” Note: There was no auto A8 option available in Europe for 2015.
2016 - “With a manual transmission, the system is only active in Eco mode. With an automatic transmission, the system is available in all modes, but is more aggressive in Eco mode.”
2017 - “With a manual transmission, the system is only active in Eco mode. With an automatic transmission, the system is available in all modes, but is more aggressive in Eco mode.”
2017 Grand Sport – “With a manual transmission, the system is only active in Eco mode. With an automatic transmission, the system is available in all modes, but is more aggressive in Eco mode”
2018 - “With a manual gearbox, the system is only active in Eco Mode. With an automatic transmission, the system is available in all modes, but is more aggressive in Eco Mode.”
USA
2015 – “With a manual transmission, the system is only active in Eco mode. With an automatic transmission, the system is available in all modes, but is more aggressive in Eco mode.”
2018 – “With a manual transmission, the system is only active in Eco Mode. With an automatic transmission, the system is available in all modes, but is more aggressive in Eco Mode.”
2018 Grand Sport – “With a manual transmission, the system is only active in Eco Mode. With an automatic transmission, the system is available in all modes, but is more aggressive in Eco Mode.”
2018 Z06 – “With a manual transmission, the system is only active in Eco Mode. With an automatic transmission, the system is available in all modes, but is more aggressive in Eco Mode.