I think he is trying to figure out if using premium in the 1.5L will provide any benefits. While I haven't tried it, I would guess there would be zero benefit. Premium fuel is never even mentioned when specs are shown on the 1.5L, and since there is no more BTUs in premium than regular, the only benefit would be a cleaner engine from more detergents, but no more power or gas mileage. IMHO !
2018 Equinox LT1 1.5 L 4 cyl, AWD, S/R Cajun Red Tintcoat/Black
2010 Equinox LTZ 2.4 L 4 cyl, FWD, S/R Cardinal Red/Black