I will take a pair...
Jon's research is spot on as it pertains to the square shape retaining the heat longer,,, assuming the extra mass does not first work as a heat sink,,, so in theory the first cup of morning coffee will lose some initial heat, so therefore you must drink your first cup quicker, now when you refill the already warmed mug shall in fact maintain the temp of the coffee for a longer duration.
If this sounds like BS,,, then you too are correct,,,,
Just having fun Jon,,,
I want two of them ECTA Squgs (square mugs) to assist with the fund raiser.
I will be there in June (out to sea in May)
Charles