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Don't be fooled into thinking you won't have temperature and pressure gains with the G614's as well.
I have them and over a 3000 mile trip with pressures set at 110 lbs and air temperatures ranging as high as low 90's and down to 65 or so the average pressure gain was 15 to 20 lbs. The ambient air temp did not make a real big difference except on our first leg when it was only 45 degrees and climbed to around 70 during the day.
At 80# your pressure gain was about 15 lbs or a bit more, the same gain was indicated when you set the tires at 75#. Every day the pressures on my G614's rose by at least 15# but rather than lower the pressure from the 110# I upped the alarm pressure 10 lbs.
I don't think the pressure gain was abnormal on your Marathons, I bought the TPMS after trading in my Marathons so can't compare on a personal level.
You won't go wrong with the G614's but they are pricey...
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