Poor fuel mileage replace air fuel sensor. Coad P0171, P2195, P2A00

Check for VACUUM leaks, if nothing found watch the B1S1 upstream O2 data while spraying some carb cleaner in throttle , should go full rich at .9v if voltage cannot be raised close to 1v then O2 sensor is bad. From the codes your getting I highly suspect it is, indicating lean to computer which is compensating rich causing poor mileage

SM-G960U ?

 

Might try something for the injectors, like kreen, berrymans b-12 chemtool, or anything with PEA (aka techron) in it.

Here is the workup for DTC P0171 : https://share.qclt.com/%E4%B8%B0%E7%94%B0%E6%99%AE%E7%91%9E%E6%96%AF%E5%8E%9F%E5%8E%82%E8%8B%B1%E6%96%87%E6%89%8B%E5%86%8Cpdf%E6%A0%BC%E5%BC%8F/Repair%20Manual/04pruisr/05/2054m/cip0171.pdf

Here is the workup for DTC P2195 : https://share.qclt.com/%E4%B8%B0%E7%94%B0%E6%99%AE%E7%91%9E%E6%96%AF%E5%8E%9F%E5%8E%82%E8%8B%B1%E6%96%87%E6%89%8B%E5%86%8Cpdf%E6%A0%BC%E5%BC%8F/Repair%20Manual/04pruisr/05/2054m/cip2195.pdf

 

Have you cleared the codes yet? If not can you see if you can find freeze frame data for when the codes set (never used a tech stream so not familiar with where to find it). looking at that screen shot shows no fuel trim issues at that engine speed and that time . That doesn't mean the upstream sensor (actually labeled as AFS air fuel sensor on this model) is failing at some point and seeing the freeze frame data might give a clue.

The O2 data listed as B1S2 is the downstream sensor (used mostly for catalyst efficiency testing)which will be in the .1-.9v range . Whereas the upstream AFS (which the codes set relate too) will be around 3.3v with higher than 3.3v being lean and lower that 3.3v being rich (the opposite of the downstream O2)

SM-G960U ?

 

What did the old catalytic converter look like inside, and did you save it? (150k isn't much on a cat)

When were the plugs last replaced?

Could you describe 'rough idle' a little more, is it missing and shaking?

 

Sounds like you've cleared the codes so wont have any freeze frame data stored. But worth learning how to retrieve it.
Maybe between replacing AFS and fixing vacuum leak at throttle body you fixed it. If it had learned bad fuel trims it will take awhile to relearn so may have run rough for a bit as it relearns correct trims.

A bad hybrid battery will cause bad mileage as the motor will run most of the time (basically turns it into a gas powered car pulling a heavy battery around) .I purchase my 04 with a bad battery and the dreaded p080a code replaced the bad cells in the battery and milage was about 50-52mpg for about 9 months then I knew something was going bad as acceleration slowed and engine started running a lot more than usual mileage started dropping to about 45mpg then a week later leaving work accelerated out of parking lot all the warning lights came on with the p080a replace hybrid battery code(milage was down to 40mpg) . Cleared it but knew it was rebuild time again . Monitored voltages and found the bad cell ,replaced the bad cell and now I'm back to 50mpg. So watch your battery status on the MFD and if if going up and down rapidly and dropping into purple a lot causing motor to start this might be causing your terrible mileage.

SM-G960U ?

 

You can test the modules under load, while driving and stopping. If none are coding then no pressing need.

If the HV battery hasn't failed, it would be a great candidate.

A long shot, but clean the MAF if you haven't recently.

Try reinstalling the old A/F sensor and see what happens.

The kind of engine shaking you describe should be logged in techstream.

Can you clarify that the new (used) catalytic converter and upstream A/F sensor are both OEM (denso)?

Were the 10k old spark plugs purchased locally or online?