The American Council for an Energy-Efficient Economy (ACEEE) is out with its 18th annual environmental ratings for vehicles. As cities work to reduce vehicle emissions and parking challenges – this year’s winner is going to look pretty attractive. That honor went to the Smart Fortwo Electric Drive made by Council Lead PartnerMercedes-Benz – and it’s not the first time it has won. But what’s different this year is that the Smart Fortwo received the highest green score ever. Six out of 12 places in this year’s Greenest List were claimed by plug-in electric vehicles.