Retail gasoline and diesel prices are up more than a $1 a gallon from October 2004.

Biofuels compete with retail gasoline and diesel prices which have substantial taxes included.

He warned that food prices could rise as a result of high diesel prices.

In addition, diesel prices jumped from $1.98 a gallon before the storm to about $2.25 today.

But diesel prices, which are tied to the demand for home heating oil, are beginning to decline.

Motorists might want to look at diesel prices to get an idea where gasoline costs are headed.

"The cost of doing business has gone up, anything from general mining costs to diesel prices."

There is some doubt, however, over whether refineries can keep up with that demand without a sharp rise in diesel prices.

An increase in diesel prices is also widely expected.

So even if diesel prices spike during the winter or when hurricanes shut down refineries, you are likely to come out ahead.