California diesel is also some of the best in the nation, with a 48 minimum cetane rating. But the formula costs extra at the pump, especially during a gasoline squeeze. Just paid $2.27, with many CA stations charging more than $2.50 for diesel.

But for those irked at cumbersome regulations, remember the 1970s, when flying into Los Angeles was like submerging into a sea of crap. No more Stage II and III smog alerts, and few Stage Is.

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'91 300D 2.5 Turbo 330K
'00 VW TDI Golf, 190K
'67 BMW R50/2
'73 Norton Commando Interstate