Temperature Gauge, Seems a bit too low? Options

[Serhey]

my temperature gauge always seems to be a bit too low, now i know its not good for the car to over heat but i also dont think its a good thing for it to be under. Now the car runs fine, atleast as far as i know, ive driven and owned cars before this celica, and it doesnt seem to act any differently, accelerates fine drives fine even driven it for 5 hours at a time and it was fine (i've only owned it for 2-3 months) but whenever i drive it the temperature gauge on average stays maybe 1/5 or at best 1/4 of the way up, way below the middle. could the gauge itself be broken or is it something bigger then that?
i've also turned off the heat to see if it had any affect on it and it seemed to go up a tiny bit but thats not the way i want to fix it

[Bitter]

its pretty important in chicago to get the 50/50 mix, we do see overnight temps as low as -25F (-32C). also, tap water has chlorine and minerals in it which are very much not good for the cooling system, chlorine is highly corrosive to aluminum and the minerals can buildup and create clogs.

just drain the block and radiator and refill. if you feel the need to flush the block then do so, but be sure to re-drain it and flush it with some distilled water or blow the water out of it with compressed air. typically though the block does not need flushing, its the heater core and radiator which need it.