The environmental protection agency and the national highway traffic safety administration are coordinating standards for the production of clean vehicles through regulating reduced greenhouse gas emissions and improved fuel use from on-road vehicles and engines. which of these would not be a goal of the epa and nhtsa? a) reduce oil usage by increased fuel economy. b) curtail ghg through better emission filters. c) diminish reliance on foreign sources of oil. d) decrease ghg emissions with efficient engines.