Instead of stuff like SE, LE and XLE, the different options packages or “trim levels” on the 2010 Prius will be demarcated by roman numerals II, III, and IV. There is no Prius I. Odd. Probably to set it apart from your normal, not-getting-50-mpg cars. [Kicking Tires]
2010 Prius Uses Roman Numerals For Trim Levels. Eh?
By March 11, 2009