
A final rule for 2017-2025 CAFE standards won’t be published until September, but a pre-publication notice by the EPA [PDF here] reveals some of the key details we’ve been looking for. The broad strokes, which we are already well aware of are shaping up as follows:
NHTSA currently intends to propose standards that would be projected to require, on an average industry fleet wide basis, 40.9 mpg in model year 2021, and 49.6 mpg in model year 2025. For passenger cars, the annual increase in stringency between model years 2017 to 2021 is expected to average 4.1 percent, and to average 4.3 percent between model years 2017 and 2025. Like EPA, in recognition of the utility requirements of full-size pick-up trucks and the unique challenges to improving fuel economy compared to other light-duty trucks and passenger cars, NHTSA intends to propose a lower annual rate of improvement for light-duty trucks in the early years of the program. For light-duty trucks, the proposed overall annual rate of fuel economy improvement in model years 2017 through 2021 would be 2.9 percent per year. NHTSA expects to change the slopes of the fuel economy footprint curves for light-duty trucks from those in the 2012-2016 rule, which would effectively make the annual rate of improvement for smaller light-duty trucks in model years 2017 through 2021 higher than 2.9 percent, and the annual rate of improvement for larger light-duty trucks over the same time period lower than 2.9 percent. For model years 2022 through 2025, NHTSA expects to propose conditional standards with an overall annual rate of fuel economy improvement for light-duty trucks of 4.7 percent per year
We had heard that trucks would improve their efficiency at a rate of 3.5% rather than 2.9% for the 2017-2021, and a 2022-2025 growth rate of 5% rather than 4.7%. But then, cars were supposed to improve by 5% in the 2017-2025 period, so both truck and car standards seem likely to end up lower than what the president’s report seemed to promise. But that’s not the only bad news for anyone hoping for tough fuel efficiency standards (or, good news for truck-dependent automakers)… with the release of this notice, we have an initial sense of the loopholes that will be included, and they appear to be of the hefty variety.
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