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I just did some quick googling and found plenty of articles where they say VW recommends only up to B5 in the US, although some of the links said they recommend up to B20 in Europe.
From a green standpoint, that makes these cars less desirable. If you can't get over 50 mpg, or good mileage using a green fuel, then you're better off with a gas/electric hybrid (from a green standpoint; the diesel at 45 mpg is still better than a gas engine at 28 mpg).
One article said the upcoming diesel / electric hybrids will be mandated to authorize the use of up to B100. They should be required to phase in the ability to use ASTM compliant biodiesel over the next 10 years or so.
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