Tar Extractor makes tar, even after it is depleted.
I picked all the tar around extractor (it was depleted). I returned after many days have passed & there is so much tar...
Look at the screen below - I picked many, many tar and still there is so much laying around the tar extractor.
After the recent patch - the infinite tar bug is fixed.
Build tar extractor, when the fuel runs out - pick all the tar, return after several days have passed.