I really don't think there is any potential for overheating in any kind of spirited highway driving.
The overheating is most likely to occur when the speeds are lower and you're revving the crap out of it, i.e. RPM's constantly above 5K RPM with a lot of the time spent between 2nd and 3rd gear. At higher speeds the extra airflow seems to help keep things cool.
I'll probably be dropping out the coolant and going with distilled water with Water Wetter.
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