[Ralph]

The CAFE standards have forced technology to come faster than it would on it's own....don't you think? Lightweight steels, more aluminum, some CF at hi end, aero designs, stop/start, hybrids, all electric, etc. Small engines with turbo charging....I know turbo's been around about 100 years.....but with modern electronics controlling spark....they work good in small engine economy vehicles.

Consider how (relatively) fuel efficient some large vehicle are these days compared to in the past. Do you think manufacturers would have spent R & D without being forced? I'm ready to see them loosened up some....or frozen at current levels a while....but think they weren't all bad. I would favor indexing Fed gas tax to inflation (probably politically doable) ....especially if ear marked to roads and bridges vehicles use....not public transportation systems. Fund competing systems another way.