My guess is that most of that extra 4 million barrels/day comes from lease condensate that was previously flared (I think some OPEC members began making capture or reinjection mandatory.  Common sense told them that massive 24 hour/day flares were a waste that they would want one day).

Perhaps 1 million from tar sands (1995-2005), a few hundred thousand for "improved asphalt" from Venezula and ethanol.  The rest just better lease condensate recovery IMHO.

How much more lease condensate can be captured ?  And how long before oil recovery slows to such a low point in a field as recovery drops off and production shifts to NG and condensate that was reinjected years ago.  The condensate may actually jump the "All Liquids" recovery for a while.

I suspect that, as Peak NG approaches, many oil fields will shift to reinjected NG, further dropping oil recovery.

Actually the lease condensate is included in the lower series,  so it doesn't account for the 4 mmbpd change. It is all an increase in the percentage of tar sands, NGPL, RPG, and "other liquids."