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Apparently full-size pickups get a break for a long time under these rules.

VW is against it because the formula didn't include diesel.

Volkswagen says the current proposed rules place an unfairly high burden on passenger cars, while allowing special compliance flexibility for heavier light trucks.

While passenger cars would be required to achieve 5% annual improvements, and light trucks 3.5% annual improvements, the largest trucks carry almost no burden for the 2017-2020 timeframe.

Instead, they are granted numerous ways to mathematically meet targets in the outlying years without significant real-world gains, a VW spokesman says.

“The proposal encourages manufacturers and customers to shift toward larger, less-efficient vehicles, defeating the goal of reduced greenhouse-gas emissions,” the spokesman says.