[T]echnological feasibility definition
[T]echnological feasibility means whether a particular method of improving fuel economy can be available for commercial application in the model year for which a standard is being established.
[T]echnological feasibility means that consideration must be given to whether particular methods of improving fuel economy will be available for commercial application in the model year for which a standard is being established. This does not mean that the technology must be available or in use when a standard is proposed or issued. “Economic practicability” is interpreted to require a consideration of whether the implementation of projected fuel economy improvements is within the economic capability of the industry. “The effect of other Federal motor vehicle standards on fuel economy” requires an analysis of adverse effects on fuel economy of compliance with emission, safety, noise, or damageability standards. Finally, “the need of the Nation to conserve energy” requires consideration of the consumer cost, national balance of payments, environmental, and foreign policy implications of our need for large quantities of petroleum, especially imported petroleum. 42 Fed.Reg. 63,184, 63,188 (1977).