Consider three policy scenarios. The first maintains the current 34 mile-per-gallon (MPG) average new vehicle fuel economy target for 2020, which increases 2020 fleet economy to 28 MPG. This requires technical improvements, allowing continued production and sales of large numbers of SUVs, light trucks and performance cars. The second scenario raises the 2020 fuel economy target to 50 MPG, increasing average fleet efficiency to 38 MPG. This requires vehicle size reductions so the . vehicle fleet becomes similar to those in Europe and Asia. The third includes this fuel economy target plus mobility management policies such as road and parking.
