My guess: with supply now very close to the inelastic demand, slight changes in either can cause major price swings. Seasonal driving patterns in the USA cause such changes in demand. Hurricanes and wars cause changes in supply, but that's not as reliably "seasonal".

We can call it the "Peak Oil Buzzsaw."

Each spike slices through what's left of discretionary income and leaves the US economy in an increasing morass of bloody tatters.

-best,

Wolf