Nice conversion. I heard long time before about Twingo , which do 3l/100km. Now i find it.
Guys from greenpeace have rights. Its easy and not expensive.
Shame, that car factories with rich sheikh lobby built still cars like before 20 years.
Example:
High drag (0.3), same consumption (1986 Fiat Uno - ~5l/100km, 2006 - Fiat Punto - ~5L)
See also interesting promises Car manufacturer:
Greenpeace - The Dirty Track of the Car Industry
Fot us is only one thing remaining: homemade ecomodding