I wonder if the fact that both of your cars are diesel has any relevance here. Could the NEDC ratings be harder to beat with a diesel? Maybe the test is a "best-case" situation for diesels, more so than gas cars. We don't have many diesel cars here in the USA, so I can't really speak on epa-diesel ratings.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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