As a completely off topic aside, even post-apocalypse, diesel should still be available in any oil producing area since it doesn't take a chemical engineering PhD and a full scale refinery to extract diesel from light sweet crude. For example, in West Texas / eastern New Mexico, I would expect diesel to be more generally available than ethanol or methanol.
The challenge with gasoline is low molecular weight alkanes / hydrocarbons have a horrible octane number (40-60) and suffer from pre-detonation and knock in modern high compression engines, and the additives that go into modern fuel blends ARE complex. Even something like tetra-ethyl lead requires a functional chemical industry to produce.
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