[Ronbo]

There's still a considerable amount of wasted energy going out your tailpipe.

If the auto manufacturers would address weight as they were forced to address engine efficiency, we'll have even faster, better handling cars than we now have.

My favorite line from Apollo 13 "It's not a miracle, we just decided to go".

Not only can we do this, but with the ever increasing amount of cars on the road we should be doing this. If it wasn't for the 20+yrs wasted in apathy and self pity by (mainly) the US car mfgs. we'd already be there by now.