Fuels used in light-duty vehicle transportation have undergone a diversification in the United States over the past few decades. These fuels include liquid and gaseous fuels and electricity, which are derived from solid, liquid, gaseous, and renewable energy sources. The search for relevant and appropriate transportation fuels has been driven by economic, national security, and environmental concerns. Fuel economy improvements can lead to significant annual fuel cost savings for Americans, and producing fuels from domestic resources has the potential to increase U.S. jobs, support rural economies, reduce tailpipe carbon dioxide (CO2) emissions, and, by keeping energy financial resources in the United States, add to U.S. energy security and resiliency. The three reports U.S. DRIVE is publishing in 2019 on behalf of its Fuels Working Group (FWG), are focused on an assessment of the potential of a range of higher octane conventional and renewable fuels to enable increased light-duty vehicle efficiency and reduced well-to-wheels (WTW) greenhouse gas (GHG) emissions, and their potential impact on fueling infrastructure.