I grew up in an Humble Oil Co "camp" (residential area )...
During the gas rationing of WWII, my dad ran our old "beater" Model "A" on "casinghead 'drip' gas" -- and saved the rations for the "good" car...
Most of the field guys did the same: as best I can recall, every "christmas tree" had a "drip gas" can... '-)
/johnny
My dad worked for Texaco and told me stories of old Kansas farmers who would come around the wells where he was the pumper to get some “drip” for their Model A pickups. His brother-in-law was the operations engineer for the Texaco natural gasoline plant near Atlanta KS, later transferred to operate a plant near Perryton in the Texas Panhandle where he retired in the 1960s, returning to KS. I didn’t know that such plants were still part of regular oilfield operations these days.
Clear as water with an octane rating of about 75 or 80. Clatters like hell in a vehicle with any compression. But if you don’t have to be in a hurry it will get you there.
Pre-ignition so bad it sounded like you threw a handful of ball bearings down the engine.