Diesel in California is running over $8 a gallon even as oil prices fall, which is bad news for drivers, truckers, and anyone counting on cheaper fuel.

• A fill-up of number two diesel in California just cost more than $8 a gallon.
• Gas and diesel are supposed to be getting cheaper as oil gets cheaper, but that is not showing up at the pump.
• Biodiesel blends are causing problems too, clogging up newer diesel engines.
• High fuel costs are eating into people's savings, a sign the economy is weaker than the headlines suggest.

Outlook: Prices this high are unlikely to hold for long, because people simply cannot keep paying them.