R&D research and development

RD&D research, development, and demonstration

RPS renewable portfolio standard

SAE Society of Automotive Engineers (now SAE International)

SMR steam methane reformer

SO2 sulfur dioxide

SOFC solid oxide fuel cell

SUV sport utility vehicle

USDA U.S. Department of Agriculture

VEETC Volumetric Ethanol Excise Tax Credit

VMT vehicle-miles traveled

VVT variable valve timing

WTW well to wheel

ZEV zero emissions vehicle

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