The meaning of the mysterious "230" ad that's been showing up online and on TV was finally revealed as the number of miles per gallon General Motors' new Chevy Volt will get once it rolls off the line, once production gets under way in 2010. The campaign, created in conjunction with Starcom New York, inspired reader speculation, but it also drew criticism. "Your viral campaign isn't working because we're only spreading the confusion rather than hype over a new product," wrote one blogger.

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