engine light

my engine light is on in my 2016 Chevy Impala LTZ but I have taking it to
auto zone and had it check out and they said that everything looks good.
but the gas thing said that i need to do a gas treatment or change my gas
fluid out. so I did a treatment and it went off for a day but it came back on
so I thought that I my need to change to a different level of gas which were
93 then my car ack like it didn't want to start so I use it again and it still ack
like it didn't want to start but once it did start for those time I did use the 93
I didn't have that probably any more with it starting once it did start but the
engine light was still on so I use gas treadment again and it went off but it
came right back on so I went back to the 89 gas and it ack like it didn"t
want to start again but not like with the 93 and the light have came back on
but the car runs good. I just don"t understand why the light is staying on...
Help me please