In looking on the EPA's vehicle emissions website "http://www.epa.gov/autoemissions/" I am under the impression that there is more than one level of clean when it comes to the prius and other low emission vehicles. It seems from what's on that website that the cleanest vehicles are only available in some markets (California, the Northeast) and that the cars that are sold in the rest of the country have a lower threshold for emissions standards. The EPA rates emmissions for a vehicle from 1 to 10, ten being best and 1 being worst. The Prius they say is available in the select markets of course has a rating of 10. The prius that is available in Florida (and most of the rest of the country, carries a rating of 7, which is the same as many other vehicles, both hybrid and conventional. Please respond as to the validity of this info.