Toyota has issued an adjustment on the preliminary EPA fuel economy numbers provided during the recent media rollout of the 2010 Prius. (Earlier post.)
While the combined rating of 50 mpg remains unchanged, the city rating went up one mpg and the highway number went down one mpg. Therefore the revised preliminary EPA fuel economy ratings for the new Prius are 51 city/48 highway/50 combined.
The error, Toyota said, was due to a misinterpretation of preliminary data.