The Hyundai Ioniq Electric has taken the highest-ever green car score in American Council for an Energy-Efficient Economy’s annual Greenest vehicle award.

Hyundai’s new EV nudged ahead of the BMW i3; while both earned green scores of 64 points, the Ioniq was slightly cleaner with 0.78 points on the environmental damage index (EDX), compared to the i3 getting 0.80.

Each car is given a green score by ACEEE based on an EDX, which estimates pollution coming from vehicle manufacturing, the production and distribution of fuel that powers the vehicle, and vehicle tailpipe emissions.

ACEEE was impressed that the Ioniq midsize sedan is the largest car to take the award in the past 10 years, with only compact or subcompact cars having previously taken the lead over that time period. Panelists were also impressed with the 110-mile per charge range, with the possibility of the second-generation version going 200-plus miles. They also looked at the upcoming Ioniq hybrid version, which scores comparably to other vehicles that made the Greenest list.

Toyota’s Prius family did very well in this year’s rankings. The standard Prius Eco took the third spot, while the Prius Prime plug-in hybrid and Prius C small hybrid took spots 8 and 9. The Prius Eco and Prius C took the number 1 and 2 spots on the “Greener Choices” list this year, which identifies practical options among widely available, automatic transmission, petroleum-fueled models.

Mercedes-Benz AMG G65

Mercedes-Benz AMG G65

Mercedes-Benz was called out for making five of the top dozen Meanest vehicles, which are considered to be the least friendly to the environment. The Mercedes-Benz AMG G65 was named the Meanest vehicle on this year’s list, tying with the Chevrolet G2500 Express passenger van. Both vehicles had an EDX of 3.02 and an overall score of 21.

The Meanest list is filled by large SUVs, heavier medium-duty vehicles, and European luxury cars. Owners tend to love the power and performance, but are not driving these vehicles for environmental benefits.

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Battery electric and plug-in hybrid vehicles dominated the Greenest list for this year, which is still relatively new for the ranking.

“For the second year in a row, plug-in electric vehicles—all-electrics and plug-in hybrids–dominate the Greenest List, proving that these vehicles are really coming into their own,” said Eric Junga, transportation research analyst at ACEEE. “Even the all-electrics are associated with significant emissions, however, arising from vehicle production and the electricity used for charging. It’s notable that conventional hybrids continue to be environmentally competitive with the plug-ins, taking four of the Greenest slots.”

Those four hybrids include the Prius Eco, Prius C, Honda Accord Hybrid, and the Kia Niro Hybrid. The Accord Hybrid was new to the list this year, along with the Chevrolet Bolt all-electric car.