The safety effects of CAFE standards are assessed by Ted Gayer guest blogging at Vox Baby. After a summary of his sophisticated analysis of CAFE and safety, we get this conclusion:
By creating an incentive to build larger light trucks, the new CAFE standards will likely not achieve their goal of protecting drivers’ safety. Aside from this, I should point out that I agree with Andrew: the pertinent regulatory issue is not the total fatalities resulting from the mix of vehicle types. A consumer can decide for herself how much to spend for a safer vehicle. What she can’t decide is how threatening a vehicle other people should buy.
I do think there was another reason for the structure of the new CAFE standards. U.S. automakers make larger light trucks than their foreign competitors, so a uniform light truck CAFE standard hurts domestic automakers. I think this gets at Andrew’s concern that CAFE standards are not transparent: here’s an example where they can be used for protectionist purposes. So I throw my hat to the politically implausible goal of scrapping CAFE and replacing with a higher gas tax.
The analysis is better than anything you'll get here, mos' def'. Except, it is a bit light on the sarcasm. Shame.