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The 2018 Automaker Rankings by the Union of Concerned Scientists finds that while average emissions from new vehicles have reached record lows, the pace of reduction is slowing due to a market shift toward SUVs and inconsistent investment in efficiency technologies. Honda is the top-performing full-line manufacturer, while Tesla leads overall with an all-electric fleet. The 'Detroit Three' (Ford, GM, and Fiat Chrysler) consistently underperform compared to the industry average. The report details the deployment of fuel-saving technologies—such as gasoline direct injection, cylinder deactivation, and electrification—and argues that strong federal standards are essential to prevent manufacturers from prioritizing performance over emissions reductions.

The Union of Concerned Scientists' 2010 rankings identify Honda as the greenest automaker for model year 2008, followed closely by Toyota and Hyundai. The report highlights a significant performance gap between these leaders and the 'Detroit Three' (Ford, General Motors, and Chrysler), who consistently rank at the bottom due to lower fuel economy and higher emissions. While government standards have improved smog-forming emissions across the industry, global warming emissions remain a key differentiator. The analysis also examines the impact of hybrid and flexible-fuel vehicles, noting that while Toyota's Prius significantly improves its overall score, flexible-fuel vehicles often serve as a loophole for automakers to meet fuel economy requirements without providing real-world environmental benefits.

The Union of Concerned Scientists' 2010 Automaker Rankings evaluate eight major car companies using government data from model year 2008. Honda is ranked as the greenest automaker, while Chrysler is identified as the most polluting for the fourth time in ten years. The assessment emphasizes that overall environmental performance depends on cleaning up entire fleets, including high-volume sellers, rather than relying on a few niche green models.