Q: Engine temperature

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Hi, my audi is a 2.0 liter turbo diesel 2013 year model. on a highway engine temperature usually go up to normal 90C and stays there, but as soon as I start driving in the town or when I stop, it falls to 50-75C . Is this a thermostat related problem or more like sth else? just bought a car so not sure when it started doing so but I see this is not normal as well as MPG isn't. Thank you.

My car has 100000 miles.
My car has an automatic transmission.

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