I'm not sure of the exact number. If you look at the spikes when they're up at 25¢, it depends when you.... The Conference Board found that the margin was around 11¢. If you look at 2007 to date, it is high. If you look at 2005, it's 14¢ and 15¢.
So you can always look at little periods like this spike--the most significant shortage ever in the U.S. of refined gasoline. The EIA called it unprecedented, and that spiked the prices up and our oil companies priced it at market.
Don't forget, we are the largest single supplier of gasoline now to the U.S.