400 per month, that is quite less.
In this case you will face unnecessary oil change expense at least, and some other maintenance items thrown in. I managed to avoid some expenses like brake service and filter changes because the mileage wasn’t even close to the period that Kia has set.
Eg. My “5,000 km service” was at 1,700 km and “10,000 km” was at 2,800 I think.