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Welcome to the Forum.
You may be right about the thermostat not closing, when you are driving, particularly now that the weather is colder, there is a lot of cold air passing over the radiator, so a closed thermostat would allow the engine to warm up, but if it is continually open, this may never happen, conversely, when the car is standing, there is no cold air going through the radiator, so it does start to warm up
As your white smoke disappears when the engine is warm, it probably is down to condensation, not helped by the open thermostat.
Fuel gauges do tend to read as you say, but it shouldn't jump all over the place, if it does, it probably needs a new tank unit, although you will probably get used to it how it is.

I have no idea about the sloshing sound, - can only suggest that you keep the tank reasonably full.
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