The report models a real carrier profile, Lone Star Freight, 55 trucks, dry van, Texas for-hire, and works through exactly what June through August cost them under three common surcharge configurations. The twist this cycle: the carriers hit hardest weren't on quarterly resets, they were on monthly ones, locked to July's still-low average while diesel climbed past even April's peak. The numbers don't appear on any invoice. They show up as compressed margin when the month closes.