Erratic temp gauge


Jul 21, 2017
2011 c220 Amg
Hi guys I'm a newbie to the forum so please bear with me,
I have a 2011 c220 the temp gauge seems to fluctuate whilst warming up, about 8 miles into my daily commute the temp gauge will be reading about 80deg (which by 8miles I'd expect it to reach the 90deg mark) the temp will drop about 10deg and them gradually increase up past 80deg and will sit at 90deg, my fuel economy is still in the 50's and my heaters are red hot, which through my knowledge contradicts a possible thermostat issue anyone shed any light or help please?

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