[WonkeyMonkey]

Just to add to the information on this thread, and I feel this will be relevant here:

Rolling Coal is accomplished by running the fuel to air ratio very rich, nearly all diesel motors cannot accomplish this without modifications to the engine and the emission control system. Generally this is a side effect of some modifications meant for increasing power by increasing fuel flow but taking it past the point all of the fuel can be burned; either on purpose to roll coal or on accident because of mistuning. The idea behind rolling coal, in my experience, is showing off your diesel motor which is many times more expensive and powerful than standard gasoline motor, and showing off it has been modified for even more power.

The article is most likely vaguely referring to this "Prius Repellent" YouTube video when it talks about rolling coal: https://youtu.be/hsC0kLNSLAQ

Although at the same time you have more popular Youtubes talking about how rolling coal is just a little too obnoxious: https://youtu.be/HjCPW2nj7do

The primary purpose behind rolling coal is not to attack Priuses, although it is absolutely terrible for the environment, and to nearly everyone very obnoxious.

[gm-conspiracy]

Are your "rolling coal" experiences based in WV?