A team from the University of Tennessee and the National Renewable Energy Laboratory (NREL) has the fuel savings due to fuel economy improvements over the past 43 years amount to approximately two trillion gallons of gasoline. They further estimated that roughly one-fifth of the savings can be attributed to gasoline price increases over the period and four-fifths to fuel economy and greenhouse gas (GHG) standards. Their paper is published in the journal Energy Policy . Estimated attribution of fuel savings due to fuel economy improvements to light-duty vehicles since 1975. Greene et al. Since 1975, the test-cycle fuel economy of light-duty vehicles (passenger cars and light trucks) sold in the U.S. has almost doubled. Also since 1975, light-duty vehicle travel increased by 134% while fuel use increased by only 37%. Fuel economy improvements on laboratory tests gradually became real improvements on the road as newer, more efficient vehicles were […]