Wiktionary
n. (context Canadian Prairies English) gasoline priced with reduced taxes for farm use, identified by adding purple dye.
Wikipedia
Purple Gas is a 2003 independent feature film, starring Dana Andersen, Belinda Cornish, Josh Dean, Donovan Workun, and Ron Pederson. Mark Meer provides the opening narration. It was directed by William Minsky and produced by Randal Atamaniuk. Original music score by Jan Randall.
Usage examples of "purple gas".
They prick her hand on the handle and she turns the purple gas down.
The purple gas giant around which the base orbited was already a discernible half disk.
A jet of purple gas shot out of a fissure and swept Alien out of the air.
Directly overhead is the dark rift, running like a jagged cosmic river of purple gas across the very center of the magenta cosmos.
The vast pinwheel of red and purple gas covered all they could see of the northern sky beyond the boras.
Ahead, the earth had turned to black and purple gas that danced frenetically as if seeking to free itself from the rest of the atmosphere.
Where he'd left her there was now a glass case filled with purple gas.
In a few spots the streaks intersected and abruptly stopped where threshkreen kinetic energy weapons intersected with the landers of the People to create spreading clouds of glowing, roiling purple gas.