S The Environmental Protection Agency just released their 2009 EPA Fuel Economy Guide and we've pored through the hot-off-the-presses data to pull out this list of the ten most fuel efficient cars for sale in the US next year. Not surprisingly, the Toyota Prius once again tops the list with a combined 48 mpg city/45 mpg highway performance. Though hybrids take four of the top five spots, the Volkswagen Jetta/Jetta SportWagen Diesels cracked the top ten with a 30/41 mpg rating. Also showing up in the lineup for the first time is the new Chevy Cobalt XFE with a fuel economy rating of 25/37 mpg. The rest of the list and the top performers in each category below.