Because of the kooky laws in CA regarding both the restricted sources of crude for fuel refining and the low emissions-biased blending of fuel, there is less raw material available to refine fuels for CA than is the case in other states. RIght now it is so profitable to make gasoline that the limited refining capacity for making fuel from crude is biased toward gasoline production, which has created a supply problem for diesel. That is the explanation I've been given for why a fuel such as diesel, which takes less work and $$$ to refine than gasoline, now costs as much as $1/gallon more at the pump than it did eight or nine months ago.

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Richard Detoy
'84 300SD
'76 Moto Guzzi 850 Le Mans