Optional location for a PCV breather hose. Like the optional location for the oil filler.
If it is not leaking leave it alone. If you want it to look better cut it off flat.

As for why somebody would do that. We have seen this one time before and nobody has a clue.

I think tourist imports came with the henway option that mounted there

Rick hit the nail on the head, here's another thread for cross-reference:

viewtopic.php?t=74111

Doesn't matter if plugged or open to be honest.

On my '94 it is for a tube belonging to the air pump system.
viewtopic.php?f=1&t=78097

That’s really bad fuel economy , you should be getting at least 16 l/100km, but I wouldn’t change the throttle yet

Are your coils and plugs and air filter all new or under 30,000 k old?

Read the tops and look at the date code

Format is YYWW where the first two digits are year of manufacture and the WW is the week, 01-52

Your highway mileage is excellent , that vacuum leak could be causing the loss of efficiency

Vacuum leak is your problem and spark plugs if they are not cheap Bosch copper plugs properly gapped. Gap is critical on turbo engines. That leak is messing with Maf and o2 sensors readings which results in higher fuel consumption. In stop and go traffic with short distances...add there automatic tr...

After you replace the hose and correct gap(if it's not gapped correctly),remove negative battery cable for 15min to reset fuel trims.