fleetwide fuel-economy average auto.

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The initiative had been under discussion for more than a year, but the issue has taken on a new urgency with the passage in December of a law requiring automakers to produce cars and trucks with a fleetwide fuel-economy average of 35 miles per gallon by 2020.

Заранее спасибо

[Peter Cantrop]

имхо
средняя величина экономии топлива по "автопарку"