[Instead of a #, I used (X cubed) for the Value.]
The Fuel Storage Tanks at various Refineries have been contaminated w substances which seize up Pistons, clog fuel lines/injectors/turbine sprays/etc. The dispersal was a coordinated Inside Job timed to hit the Holiday Travel. Nearly ALL Filling Stations, Storage Tanks, Airports, Trains, etc are shut down and Authorities are scrambling to find untainted supplies.
Military vehicles are largely unaffected because of their added screening at point-of-delivery. Also, the Diesels can be powered by other sources. Bases rotate which Tanks they use throughout the year, so the Saboteurs who were caught tampering w the Tanks were the only ones able to access them. Therefore, only certain Bases and certain Tanks were contaminated.
There isn't enough Military Supply to give the Commercial Air/Land/Rail/Oceanic Vessels, so 85% of Travelers are stuck where they are, and Transport has ground to a halt w untainted fuel being more valuable than any Commodity which they would deliver.
Food, Coal (electricity,) etc is only expected to last 2-3 days now. Anyone not prepared will have to turn to "other means" of survival.
What do you do...? Hours, Days, Weeks.