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>Diesel fuel consistently runs about 50 cents a gallon more here.< It's 50 cents a gallon more than regular unleaded. It's not much more than premium unleaded around here, in fact I've seen some stations where Diesel fuel was cheaper than premium. >But if diesel, inherently a lower grade fuel costing less to produce< Diesel fuel was once a fuel costing less to produce. But that has not been the case since around 2007 and ultra-low sulfur Diesel. You also forgot that Diesel fuel gives significantly higher mileage, enough to more than make up for the higher cost.