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fuel economy(2)
greenhouse gases(2)
united states(2)
analytical method(1)
atmospheric chemistry(1)
automotive fuels(1)
birkeland currents(1)
carbon emission(1)
comprehensive assessment(1)
corporate average fuel-economy standards(1)
cost analysis(1)
dynamics(1)
emission control(1)
emission reduction(1)
energy conservation(1)
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