I have to admit that a CAFE standard of 54 MPG by 2025 (ie in 13 years) is rather modest. What I'm more interested in, is in seeing the "Phase in" rate. that's a 30mpg improvement over 13 years. or roughly 3mpg/yr. Now if that is backloaded - it means nothing. So as it stands now, we are supposed to go from 24.5 mpg to 35.3 mpg in the next 4 years. http://www.nhtsa.gov/staticfiles/rulemaking/pdf/cafe/2017-25_CAFE_NPRM.pdf and then an additional 14 MPG over the next 8 years. That's actually fairly reasonable. Since what it does is somewhat "front load" the effort (2.5mpg improvement/yr for the next 4 years, then 1.7 mpg for the next 8 years). So in 4 years, the Gas Guzzler premium will be quite significant.