Here is an article in Japanese:
http://www.mainichi-msn.co.jp/keizai/kigyou/news/20070811k0000m020076000c.html
Rough translation by me --
Toyota: Prius Meets National "2015 Fuel Efficiency Standard"
Toyota announced on August 10 that the electric-engine hybrid Prius
is the first model to meet the "2015 fuel efficiency standards" set
by the Ministry of Land, Infrastructure and Transport. These
standards call for a 20% improvement over today's vehicle mileage.
The new standards call for automakers to meet improved mileage
standards by '15, with different standards for different vehicle
weights. In the Prius class vehicle weight, the new standard calls
for be 17.2 km per liter of gasoline [40 mpg], but the Prius greatly
exceeds this, at 29.6 km per liter [70 mpg]. The latest model Prius
has been approved for sale starting September 3.
(byline Arimasa MORI)
Mainichi newspaper, August 10, 2007 20:34