Since the second half of 2007, the price of diesel fuel in the United States climbed from its traditional place selling at or below the price of regular gas to a point 15-20 percent higher than premium through much of 2008. For automakers that were planning on introducing new 50-state legal diesel vehicles in 2008-9, as well as drivers looking forward to buying them, that was a big problem. The price differential ate up much of the operating cost savings that diesels provide thanks to their greater efficiency. Even as gas prices dropped from their highs of $4 per gallon last summer to less than $2, diesel remained stubbornly expensive.
That situation has finally changed in recent weeks though. On a trip to northern Michigan a couple of weeks ago we started seeing stations actually selling diesel for less than regular gas for the first time in two years. That same scenario has now come to the Ann Arbor area, where I shot the sign to the right today on my way to get groceries. Nationwide, diesel is now averaging just under mid-grade gas at $2.023 while regular is at $1.910.

[Source: Energy Information Agency]

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