Grande and 1.8 cvt have same fuel economy figures. I have 1.8 cvt though. Depends upon how its mantained.
Mine is 90k driven and I have changed cvt oil of this car like twice. This is what my car was giving after 230kms from thokar on M5 at 110 cruise.
You can clearly see it improved instead of decreasing. It was 17.5 at 175kms on trip meter.
I made total trip of 1300kms to south punjab which included city and villages, and my car fuel economy meter was showing 14.8km/l at ravi toll plaza again.