This is sort of an odd thread because I am actually most interested in where/how you learned the answer to the following question:

What is the best ratio of ethylene glycol to water in coolant for a car which has overheating issues (and freeze protection and rust protection are not a concern).

In my forum reading here and elsewhere, the common answer is that less ethylene glycol is better because the specific heat of water is higher than EG. But I have read some older Society of Automotive Engineering papers which contradict this common wisdom. They say more EG makes a car less likely to overheat (up to 70%). So I am confused right now.

So ignoring all other issues (freeze protection, rust protection, water pump lubrication, etc.):

1) To avoid overheating, is less ethylene glycol better?
2) Where/How did you learn this (1st hand experience? the internet? engine handbooks, etc.)?

(for simplicity, can we assume that no other additives are being used in the cooling system (like Water Wetter or Purple Ice), because these would just complicate the question)

When time allows, I will try to post some of the observations from these old research papers. But for now, I would really appreciate your answers to those two questions. The more responses the better, as I am most curious about how people have learned about this issue. Thanks so much.

__________________
1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).