Comment: The reasons have to do with

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The reasons have to do with

The reasons have to do with emissions restrictions I think and highway safety regulations. Extra hardware has to be added to contain the diesel particulate matter and extra safety hardware must be added. Both of these things make the engine less efficient and the car heavier.

This is the same reason Mercedes could not bring the smart to this country for years. The US version of the smart is crap because its too heavy.
I have a 2009 Jetta Sportwagen and hit around 45 on all highway driving, but its smaller than the Passat. And because of the DPF (diesel particulate filter) I can only use up to 5% bio-fuel.

Its badly designed regulations getting in the way of good engineering.

Every time I see an adult on a bicycle, I no longer despair for the future of the human race. -H. G. Wells