In France only two diesel models are labeled ecomotive :
- Ibiza 1.4 TDi 80hp with 60+ mpg and <100g/km of CO2.
- Leon 1.9 TDi 105hp with 50+ mpg and <120g/km of CO2
Both have a particle filter.
From the web site they reduced the weight, improved aerodynamic and used overinflated thinner tires.
The prius is rated ~55 mpg and 104g/km of CO2, but both seat are smaller.
Seat is Spanish.
Denis.
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Save money & CO2 at home :
http://ecorenovator.org/ 
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Earth absorbs 1.8 t CO2/head/yr
kg saved 2008/06-11 : 367.2 (ecodriving) + 118.6 (440 m not driven)