Re: "...asking for a return to the 55mph speed limit."  

In making the case for the typical American to join in on energy conservation efforts, it's worth considering that this would probably be an extremely unpopular move.  We should be trying to make conservation an appealing choice, and I think this does the opposite.  Is the gain in fuel efficiency worth it?

I think just rigorously enforcing the speed limit (at 55 or 65) would be enough, but we need something symbolic but effective that really doesn't limit the market forces per se.

I think the efficient speed limit idea works on many levels, and while unpopular at first to some, I think people would ultimately respect that this is a valid response short of a tax or shortages.

It certainly beats closing schools, like they did in Georgia.

But I'm open to other suggestions. What yours PDXpat?

Nothing wrong with enforcing the current speed limits.  But 55mph accross Montana would never fly.  The trend in recent years has been to increase speed limits (e.g., now 70mph in several states).

I think the public would be much more receptive to improved fuel efficiency requirements, which are more obviously associated with conservation in people's minds.  

There was a thought that someone else I know threw out.

Some states have different speed limits for trucks and for cars, and for these purposes they have a legal definition of what constitutes a truck (in his state, I think it was any vehicle over 4 tons).

His suggestion was just to lower the limit to 2 tons.  All of the big SUVs would have to slow down while everyone else zips past them.

Not really a practical suggestion, but still kind of funny to think about.

I don't suppose anyone's still reading this thread, but aren't SUV's trucks anyway for the purposes of emissions and efficiency and safety?

If places like California, which have different speed limits for cars and trucks, had enforced the SUV=truck idea from the start, SUVs would never have taken off.

Sigh...

I hear you CP! Very good point.