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Diesel will not always be cheaper. It's the most sensitive to the supply-and-demand market, the more diesel needed the more expensive it will become. For the last several years it was much more expensive than regular gasoline (until just recently, but I full believe that's a fluke).
I am not vested enough to do the math but I'm betting that the ratio of cost-per-mile between the two are becoming more and more negligible as gasoline engines continue to be more efficient.
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