| UPDATED: 3/24/17 10:31 pm ET - corrected

Calif. upholds Obama emissions rules, setting up clash with EPA over mpg targets

California approved light-vehicle pollution targets that the Trump administration has put on hold, setting up a potential face-off between federal and state regulators over emissions rules that could be expensive for automakers and a headache for consumers.


Cost of mpg fuel standards could be 40% lower, report says

Technologies such as turbochargers, advanced transmissions and lighter materials -- aluminum instead of steel, for example -- could reduce fuel

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