Actually, remember the other year, there was the introduction of mandatory ethanol in some states and the switch to summer gas at the same time and supplies ran short in the mid-west and there was a temporary spike unrelated to oil prices. That could be what we're seeing with the ULSD switch.
I remember The RoadWarrior..To understand who he was, you have to go back to another time..the world was powered by the black fuel & the desert sprouted great cities..Gone now, swept away..two mighty warrior tribes went to war & touched off a blaze which engulfed them all. Without fuel, they were nothing..thundering machines sputtered & stopped..Only those mobile enough to scavenge, brutal enough to pillage would survive. The gangs took over the highways, ready to wage war for a tank of juice