Many years ago, my brother-in-law owned a truck stop. He told me that he sold hundreds of thousands of gallons of diesel fuel for $0.15 per gallon. It seems that diesel fuel and heating oil approach being mere by-products of the refining process.

You can thank the Federal Government for the price of diesel fuel. Once they determined that it was a product in demand, they stacked tax after tax on it, the last being a major gouge (although I can't recall the exact amount) in about 1993 as part of the "middle class tax cut".

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Ted
1979 240D
165,000 miles