I suggest you buy one of those cheap "hydrometers" at the auto parts store that will tell you what the freezing point is with the mixture you are running, and adjust it so it is strong enough for the winter temperatures where you live.
Simple and you know you are protected against freezing, which is what your really worried about with antifreeze anyway, not overheating.
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2002 GT
1993 GT (SOLD)
'93 Mustang GT
RHC member #142
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