Like I said, I don't know. On a tangent, I really enjoyed the "coolant wars" over yonder. I have no idea which is best but I'm naturally skeptical of dummy-proof systems, and I prefer to know first hand what's going on and make the decisions involved.
So, I personally prefer the green coolant, not necessarily because it's best, but because I'm in control. I consider it to be just another item I need to be routinely aware of in the learning curve to being able to keep my vehicle in good shape. I don't mind routinely checking out my vehicles....in fact, I enjoy it.
I catch a lot of razzing because of this from the younger folks who've grown up relying on technology to free up time in their lives. I concede....I'm just another old fart who even hand washes and waxes his vehicles. Many would be surprised at how many problems I've headed off by discovering them while lovingly fondling every inch of my cars and trucks.
Like the fuel mileage issue about carrying it three decimal points. That's my nature, acquired and supported by my professions....where a couple of thousandths of an inch can mean costing or saving up to a hundred grand or more; or a tenth of one mg/l can determine whether my operations are within legal parameters or not.
Where's the flipoff smilie?