Santa runs on diesel. Every year, the global holiday economy depends on a short, unforgiving surge in distillate consumption that powers trucks, ports, warehouses, refrigeration, and backup generation, all under winter operating conditions. That commercially driven holiday cheer strains logistics and exposes how thin the margin has become in some already-tight diesel markets, particularly in Europe. After crude, diesel is the most economically important fuel in the system, and Christmas is when that reality asserts itself. In the U.S., distillate…