On a recent run from Boston to Cape Cod, I test drove the 2008 Honda Accord, the latest version of this family favorite. The new Accord boasts an environmental first: a six-cylinder gasoline engine that's cleaner than many hybrid systems. There's only one catch: You can't actually buy this ultra-green Accord, or the four-cylinder version that also produces near-zero pollution. That is, unless you live in California, New York or six other northeast states that follow California's tougher pollution rules. Only there can you buy this Accord, or the roughly two dozen other models that meet so-called Partial Zero Emissions Vehicle standards, PZEV for short.
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