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OwnerOfMany Yes, you can fine tune emissions, but that doesn't get you anywhere near the point the future emission standards will. The emission standards are needed for the reasons I've already outlined. And they will make a difference.
On June 19, 2015, EPA and NHTSA announced proposed rules for the second phase of fuel economy standards for medium and heavy-duty vehicles. The phase two standards, which were outlined as a key strategy in President Obama’s Climate Action Plan, call for an 8 to 24 percent increase in fuel efficiency, depending on the vehicle’s size and purpose, between the years 2018 and 2027. The standards are projected to save 1.8 billion barrels of oil, or 75 billion gallons of fuel, over the lifetime of the vehicles sold during model years 2018-2027, saving vehicle owners $170 billion. The economic benefits do not end with the vehicle owner. Since the trucking industry hauls 70 percent of all U.S. goods, and the standards will significantly reduce trucking costs, the EPA concludes that the average U.S. household will save nearly $150 a year by 2030 and $275 by 2040.
Additionally, the standards will cut carbon emissions by 1 billion tons over the lifetime of the vehicles sold during model years 2018-2027, which is “roughly equivalent to the GHG emissions associated with the electricity and power use from all U.S. residences for one year.” Tackling carbon emissions from trucks is becoming ever more urgent: according to the EPA, “heavy-duty trucks are the second largest and fastest growing segment of the U.S. transportation sector in terms of emissions and energy use” and, globally, greenhouse gas emissions from heavy-duty vehicles are growing so rapidly that they are expected to surpass emissions from passenger vehicles by the year 2030.