Battery reset?
Do you mean pull the battery cable to drain memory and reset the system?
Otherwise, the issue of fuel comes from "static - not moving - stable" state of the sender (float) in the pump assembly reading one level - to another when it's moving.
Then as you drive - your fuel sloshes around in the tank, as it gets used the level drops so it accumulates vapors - the fuel mixes with and acclimates (mixes with) to the older less volatile (if only by fumes and time spent in the tank).
So when you pump gas - the volume of fuels in one temperature is different than in another - so one fuel is warm, another may be colder - so denser - and affects the reading until that fuel stabilizes with what is in the tank - on top of the "static" - stopped your car to fuel - moment onto the drive, those sloshing moments are also affecting the average sampling means to show fuel left in the tank and the mileage calculator it has.
So, in a way, you're seeing one level static, while when you drive the level average appears to change or drop due to the AVERAGING the fuel gauge (in any car) uses to determine the level i the tank - this is done so that when you park overnight - the stabilized fuel reads one level - but changes as you drive due to the movement of fuel in the tank around that sender unit but only by slight amounts so you; are not left to panic - this was standardized years ago by automakers so people that park on an incline were not fooled by erroneous readings in the sender because it measures fuel at one level where the float is.
That can affect the way the tank can be perceived; as being half-full or half-empty - if it's in a corner - that side might be too low or too high and give you a false reading, so they had to standardize the location of the sending unit to get that right level and not let the waves upset the reading too much.
So, remember to pay attention to the number of gallons of fuel you can safely put in - it can't take no more that 12-gals max when fully empty (the Owner's manual says 12.5Gals - but you're pushing it)
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