2016 Chevrolet Cruze - am I using the wrong gas?

I have a 2016.Cruze. I have had the car in four times because the dash light keeps lighting. they say I am using the wrong gas and taking to many short trips. They are also replacing the catalytic converter. Is this true.

What dash light? The check engine light? The one that looks like a little engine?

What gas are you using and why does the dealer say it is the wrong type? Are you using regular gas in a Cruze with the 4 cylinder turbo? That car specifically states premium is required.