Ah, makes sense.

For a while, we had HP diesel available at state subsidized fueling islands leased from various stations. About five in the bay area, several in Sacramento and LA as well. Now it looks like they have another semi advanced diesel, I should look into it. At the same islands E85 is available. The price is low, I suspect you’re paying for net BTUs.

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1986 300SDL, 362K
1984 300D, 138K