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I was always under the impression (possibly mistaken) that, because you get more energy (btus) out of a gallon of diesel, it took gallon of more crude to get a diesel............
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Don’t hold me to the exact numbers, but they can crack a barrel of crude in different ways in order to get different ratios of product. In late winter they start cracking for gas and wind up with approximately 2/3 gasoline – 1/3 heat/diesel in order to build stocks for the summer driving season. In mid to late summer they switch and begin to crack for #2heat/diesel for winter heating and wind up with about 2/3 heat – 1/3 gas. Not exact as I said, but pretty close.