I found hardly nothing on the subject. I had heard about drip gas all my life, and found it strange there was nothing available on the Internet as to just what was drip gas. It is very volatile because it is, for all practical purposes, condensation from raw crude. Drip gasoline was found at some wells in the field where crude comes directly out of the ground into the well. Some product had high enough gravity and viscosity and volume enough to be used as gasoline.
Drip gasoline is untreated, unrefined, directly from the ground product.
There were a few places around in oil fields in the countryside where some of this drip gasoline accumulated. Also, some drip gasoline accumulated at the oil well site where the crude passed through heat treaters on each lease. Some gas wells produce very little crude and are more apt to produce drip gasoline. There is still some of it out there. It is not supposed to be used or sold.