Codes P043E, P043F, P2401, P2402 and P2419

That is incorrect, dont listen to whoever is filling your gas tank. That is what lead to this whole problem. The gas handle at the station is designed to shut off at a certain point. If you pull the handle out to try to fill it as much as you can, you over fill the gas tank. There are certain valves at the top of the tank that are designed to close when the tank is full, When the tank gets overfilled, the gas floods the Charcoal Canister which is only designed to handle to fuel vapors (gas fumes). This is how this all started. To correctly fill the tank, put the gas handle all the way in the gas tank filler tube. And when it clicks, stop filling it. Thats the limit the tank can handle.
Now that the canister is probably full of gas, when that happens the charcoal in it (which stores the gas fumes) breaks apart and goes through the system, It clogs up the whole system with broken up pieces of charcoal.
This also clogs the Purge Valve most of the time and causes it to stay stuck open. Hopefully because of the design of this system, since it has an orifice tube, lets hope that the tube clogged up and caught anymore of the charcoal from going into the evap system.
Unfortunately this is a self inflicted issue due to the guy over filling the tank.
If all those codes come back in a day or 2, thats most likely the cause of the canister assembly failure.
This happens alot, its the main cause of canisters being filled with gas.

The first diagram shows the front of the canister, the 2nd shows the hoses coming to and from the canister. You can unhook these one at a time and see if any gasoline comes out of them. There shouldnt be any, only gas fumes,
the 3rd diagram is the Purge valve that is supposed to open and pull the gas vapors from the gas tank and canister. It shouldnt have any gasoline in it either.
Toyota has is located in 2 different locations, so if its not here, it will be under the hood near the intake manifold, if so we will deal with that last.
The 4th diagram is the wiring harness to the assembly. Each number (AK1, SK2, etc) are electrical connectors. So check the connectors for any corrosion inside them. Most likely you wont find any.
The 5th diagram is the Cut-Off valve, its the valve that closes once the tank is full and causes the gas handle to click at the gas station, due to vapor fill.
My worry is that there is gasoline being drawn threw the system all the way up to the Purge valve and then into the engine. And thats why your going through so much gas.
On your scan tool app push the Real Time Information and see if you can find anything that says Long Term Fuel Trim. Or anything to do with Fuel Trim and tell me what its reading while the vehicle is running.
Or I see it has CO2 emissions readout.

I can only communicate through here, That's the purpose of the website. This is not a forum for automotive repair. We are all actual automotive technicians.
As for the scan data you posted, those 7 pages that say TID $06 for example, that is Mode data from the engine computer. It is Test ID $06. MID is Monitor ID and CID is Component ID. I think you might have the 3.5 Liter engine loaded on your scan tool because its reading on the last MID an Oxygen Sensor Bank 1 sensor 4 and there is no sensor #4 on your car. It only has 2. Just so you know.
I also see that Cylinder #4 misfires happening, and I think that is happening because Cylinder #4 is closest to where the Evap Hose comes into the Intake Manifold.
You will also notice it has failed all the Evap Monitor Tests, that's because of all those codes you had. It looks like some of the data on this App is in another language.
Have any of those codes come back yet?

So, there are no codes present right now? How is the drivability of the vehicle? Is the information center still indicating the poor gas mileage?

Okay, you can try taking some of the hoses on the front of the Evap canister assembly off and see if there is any liquid gasoline in them, there is a small clip on them that slides sideways and then the line can be taken off for inspection. If there's none there put it back together until you're ready to pull the whole canister down. If gas starts coming out of the canister itself, you'll know what happened.

Okay, good you got the Evap canister down. Was there any liquid gasoline in it? It also sounds like the Vent valve was stuck shut. So, did the codes return after you cleaned that valve out, or have you not gotten to that part yet? You can see by all the dust and dirt how easy it is for those valves to get stuck closed or open. If you haven't tried the vehicle with the cleaned-out valve yet, I'm hoping that will take care of the codes. With that valve being stuck closed the system would fail all of its self tests that it runs. After you get the canister reinstalled, clear the codes again and see if your gas mileage improves. Thise codes also are Historic codes, meaning the engine computer is not seeing the fault right now. That was good work, I'm impressed.