We have a 2009 Cube with 90K miles. We lose about a cup of coolant a month with regular driving. No smoke from the exhaust, no SES light, AAA did a pressure test so no leaks. The coolant in the reservoir and fill area is clean and not milky. We changed the coolant cap as well with a genuine Nissan cap. This has been going on for the 2.5 years since ownership. Anyone else experiences this?