Question

Under present US laws, by 2016 car manufacturers must ensure that vehicles made in America average 39 miles per gallon. This step was taken in order to __________.

Answer 1

Fuel savings

Answer 2

jStarting in 2011 the CAFE standards are newly expressed as mathematical functions depending on vehicle "footprint", a measure of vehicle size determined by multiplying the vehicle’s wheelbase by its average track width. A complicated 2011 mathematical formula was replaced starting in 2012 with a simpler inverse-linear formula with cut-off values. [3] CAFE footprint requirements are set up such that a vehicle with a larger footprint has a lower fuel economy requirement than a vehicle with a smaller footprint. For example, the 2012 Honda Fit with a footprint of 40 sq ft (3.7 m2) must achieve fuel economy (as measured for CAFE) of 36 miles per US gallon (6.5 l/100 km), equivalent to a published fuel economy of 27 miles per US gallon (8.7 l/100 km), while a Ford F-150 with its footprint of 65–75 sq ft (6.0–7.0 m2) must achieve CAFE fuel economy of 22 miles per US gallon (11 l/100 km), i.e., 17 miles per US gallon (14 l/100 km) published. CAFE 2016 target fuel economy of 38.5 MPG (44 sq. ft. footprint) compares to 2012 actual advanced vehicle performance of Prius hybrid: 50 MPG, plug-in Prius hybrid: 95 MPGe and LEAF electric vehicle: 99 MPGe.

CAFE has separate standards for "passenger cars" and "light trucks", despite the majority of "light trucks" actually being used as passenger cars. The market share of "light trucks" grew steadily from 9.7% in 1979 to 47% in 2001 and remained in 50% numbers up to 2011. [4] More than 500,000 vehicles in the 1999 model year exceeded the 8,500 lb (3,900 kg) GVWR cutoff and were thus omitted from CAFE calculations.[5] More recently, coverage of medium duty trucks has been added to the CAFE regulations starting in 2012, and heavy duty commercial trucks starting in 2014.

The National Highway Traffic Safety Administration (NHTSA) regulates CAFE standards and the U.S. Environmental Protection Agency (EPA) measures vehicle fuel efficiency. U.S. Congress specifies that CAFE standards must be set at the "maximum feasible level" given consideration for:
1.technological feasibility;
2.economic practicality;
3.effect of other standards on fuel economy;
4.need of the nation to conserve energy.
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