His evidence is a National Academy of Sciences study that tracks an increase in the average fuel economy of cars in the wake of CAFE. I cannot point out the weakness in this argument any better than a commenter on his site did (here and here)—it appears to ignore the CAFE-induced shift to light trucks with lower fuel economy requirements.
Drum’s article also points out that the NAS study also suggested the use of a tradable credit system, as I suggested in my earlier post. Good to know that this is concept is now accepted by a broad range of the policy community.
I still prefer the gas tax, but I am not as resolute as I was a few posts ago. If we are going to stick with CAFE, I'd recommend that it have the following elements:
- One standard, covering every passenger vehicle
- Tradable credits, to enhance efficiency
- Stiff penalties for failing to meet the standards
- A very agressive schedule of increases, legislated today for future years