I highly recommend Ow-20 or 5W-20 for 1KR engine as it's Toyota recommended for best permanence and high mileage. I have 2014 model Passo and I am using Kixx 0W-20 Tin Pack fully synthetic oil. It's performance, pick, mileage and drive everything is awesome. I am getting 19-21 with AC at motorway with a speed limit of 110KM/H and 3 persons on board. Local I am getting 15 to 16 with AC and speed range of 30-60km/h.
There is a myth among auto community, that never use OW-20 or 5W-20 oil for Passo. It's very thin and it will damage the engine during extreme heat of our summer season. But I have used OW-20 oil throughout this summer with consistent AC, long drive, local and my engine performed awesome.
As per my practical experience I highly recommend to use OW-20(KIXX NEO TIN) or 5W-20(ZIC A+) fully synthetic engine oils.