My understanding is that there is only one model of Prius available in the US (disregarding model years). Its list of features on the window sticker will include "50 state emissions package". However, in California (and a few New England states), it is rated SULEV (super ultra low emissions vehicle), but in the rest of the country it is rated ULEV (ultra low). This is because the gas sold in CA and NE contains less sulfur than gas sold elsewhere in the country. Therefore, any car that burns this gas will have lower sulfur dioxide emissions than a similar car burning normal gas.
So, if gas stations in your area offer low-sulfur gas, filling your tank with that will automatically turn your ULEV HEV into a SULEV HEV!
Douglas (2002 Silver, Wisconsin)
So, if gas stations in your area offer low-sulfur gas, filling your tank with that will automatically turn your ULEV HEV into a SULEV HEV!
Douglas (2002 Silver, Wisconsin)