Bro, I also just got my latio premium cvt not long ago, but its an old car, 5 years old. budget. Most of the things quite stock, except tyres I believe, depending on the fuel pumped, can range between 12.5 - 13.5, seldom reach above 14 I believe due to aging and all the other factors.
Sometimes find it very underpower, slow pick up, slow cutting lanes...sighs.
Originally started with Shell 95, then changed to Shell 98, much better, full tank to light come up can hit 480km. Heard Esso 8000 also quite good.