2006 Sonata I4 recent increase in oil consumption

As those who follow this ng know, I recently had my Sonata in for an
intake manifold gasket replacement due to a vacuum leak. In the 1,400
miles since the repair, the engine has consumed about 1.5 quarts of oil!
This is an engine that previously has consumed maybe 1/4 quart (if
that) between changes at 5,000 mile intervals.

hyundaitech, if you are reading this, do you have any idea what might
have caused this? Do any oil passages pass into or through the intake
manifold? I don't see any leaks, so I assume the oil is getting sucked
into the engine and burned. I haven't seen any smoke either, but I know
that catcons can burn a lot of oil and not show much smoke.

I added a quart when I first noticed the oil being low (it was just
below the add mark). At that time, I thought maybe the dealer had lost
a quart doing the repair or during the 4 mile drive to pick me up when
they had failed to replace the dipstick! Although, when we put the
dipstick in when I returned to the garage and the service manager walked
out sheepishly with it in his hand, we did not notice any oil spilled on
the engine and I have never smelled hot or burning oil. However, I just
checked the oil again and after another 400 or so miles it is already
down a half a quart so it clearly is losing oil somewhere. Once it gets
down another quart, I'm going to call the dealer as I will have
confirmed at that time that it really is a consumption issue post-repair.