I'm just saying you don't need to stick with the 50% blend. That's recommended for countries where the temperatures drop below freezing. For a more tropical country like ours the mix can be as low as 30% coolant to 70% water.

Here's citation from Enilive, a company that makes lubricants for everything from Automotive to Marine to Aerospace:
What is the right water to antifreeze ratio for my car? | Enilive oilproducts


For the Nissan GTR, the owner's manual specifically instructs diluting 50-50 coolant with water in order to get to a 30-70 mix (because the engine runs hot). 50-50 is only recommended when ambient temperatures are expected to fall to below freezing:
Page 24 of this PDF: https://www.nissan-cdn.net/content/d...ner-manual.pdf


IMO instead of blindly following manufacturer recommendations, it's important to understand why those recommendations are being made, because the manuals are mostly written for their largest market (usually USA) and do not necessarily suit all other places, climates or conditions.
And as I explained in my first reply, what's really lost when coolant level goes down is the water, not the whole coolant mix because the rest of it has a higher boiling point. By topping up with 50-50, you're increasing the coolant ratio (until you get to the next full fluid flush and change). But for our local climate a lower coolant mix is actually desirable.