Why have vehicle efficiency standards fallen short by about a third so far? Our ED explains: http://www.forbes.com/sites/ucenergy/2016/04/11/low-gas-prices-expose-flaw-in-u-s-fuel-economy-standards-as-gains-fall-short-of-expectations/#57c9663735291 …pic.twitter.com/gwaQbYUaBD
9:55 AM - 18 Apr 2016
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