In California, gas stations are facing a unique challenge. The station signs are only configured to go up to $9.99 per gallon and at several stations the price of diesel has reached that maximum. Diesel prices are higher than they have ever been in history. Worse, according to some news reports the advertising of the maximum price of $9.99 per gallon is meant to signal to truck drivers that they have run out of diesel altogether. Expensive diesel is a hit to the economy, but running out of the fuel at any price is a whole different kind of crisis....