That's a question that defies a simple answer right now. In large part that's because oil companies are so opaque about the realities of their business. Detroit News columnist John McCormick ponders the question of the recent run-up in diesel prices just months ahead of the launch of a slew of new diesel-powered vehicles. Typically, diesel fuel in the U.S. has been at parity or slightly more expensive than gasoline. But in the past couple of months it has shot up to be about thirty percent more expensive. Interestingly, that's just about the efficiency advantage that diesel engines have over gasoline varieties. Is there a connection? Who knows? I certainly don't. But when oil companies are making tens of billions of dollars in profits every quarter, it becomes increasingly difficult to cut them any slack when it comes to the subject of paying for expanded refinery capacity or adjusting the mix of gasoline to diesel fuel. I'm not saying there is any big conspiracy by the oil companies. Because we all know they wouldn't do that, would they?

[Source: Detroit News]

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