I've witnessed $4/gal diesel before. Back when Katrina hit, they started price gouging, and this one truck stop in town was at $4.00/gal when everyone else was like $2.30-2.50/gal. They lowered their price back down after people saw through their gouging and kept passing them up.

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.