That level of CO2 emission per mile would equate to about 35.5 MPG in fuel economy parlance. However — here's the big loophole — it's expected by the EPA and NHTSA that most manufacturers would apply air conditioning improvements to reduce GHG emissions. Air conditioning improvements do not enter into the NHTSA's calculation of MPG fuel economy.It sounds to me like they are simply factoring in an existing loophole: that apparently MPG ratings are for cars with their air conditioners turned off (pretty unrealistic) and the fact is that improvements in AC really would both save gas and reduce CO2 emissions, it's just that it won't make misleadingly-high-due-to-existing-loophole go up as much.
Thus, the improvement in MPG that is equivalent to the estimated 250g of CO2/mile will actually fall well short of the 35.5 MPG mark. The gap between what the fleet CAFE will be and the widely reported 35.5, would be made up by air conditioner improvements. So basically, when you buy your supposedly more-fuel-efficient vehicle in 2016, it won't have as high of a fuel economy as it could — thanks to your car's air conditioning.
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posted by filthy light thief at 1:32 PM on May 28