Modern cars have come a long way from their gas guzzling roots and with our consumer priorities becoming ever greener each year– ratings and rankings are more important to car manufacturers than ever.  The American Council for an Energy-Efficient Economy (ACEEE) released its 18th annual environmental ratings for vehicles on its newly launched website greenercars.org, which provides an online database containing vehicle environmental scores for models from the year 2000 to present. Ranked number one in the list of top twelve green cars is the third generation of the Smart ForTwo Electric Drive.  The only conventional gas fueled car to make the list is the Mitsubishi Mirage (renamed Space Star) landing in tenth place.  The rest were either plug-in electric vehicles or hybrids.  Aptly named by ACEEE as the Greenest and Meanest lists, here are rankings:   Greenest List: 1 Mercedez-Benz Smart Fortwo Elec. Drive Convertible / Coupe 2 Chevrolet Spark EV …