There's a 7.5 cent difference in taxes between California and Maryland (at least according to this: http://www.wsdot.wa.gov/accountability/GasTaxComparisonReport_jun03.pdf+california+fuel+taxes&hl=en&ie=UTF-8).

Read Tony O's post in the aforementioned biodiesel forum thread... Those california gas prices, one of the reasons they are so high is market manipulation by the oil refineries in the state.

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'81 300TD Wagon 355k (Miss Diesel)
'83 300SD 180k
'84 500SEL 190k (Parting it out)