Fuel efficiency of vehicles on the road: Little progress since the 1920s

(PhysOrg.com) -- Vehicles on America's roads today get only about three miles more per gallon than vehicles back in 1923, University of Michigan researchers say.

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<p><a href="http://www.physorg.com/news160758081.html">Fuel efficiency of vehicles on the road: Little progress since the 1920s</a></p> <p>(PhysOrg.com) -- Vehicles on America's roads today get only about three miles more per gallon than vehicles back in 1923, University of Michigan researchers say.</p>