I actually do drive an avg speed of 55 mph on my route, but only bc the traffic is fairly thin -- otherwise I'd have to go faster just to avoid being honked at endlessly or even causing accidents.
I'd love to see the limit back to 55.
1. It would be better for the enviro
2. It would force us to conserve fuel, putting less in the pockets of oil companies both foreign and domestic. And if there is a coming shortage of fuel (a la Mad Max), this will at least forestall it somewhat.
3. It's safer -- fewer crashes.
People smoke and eat poorly and so on, but only because they can't break from habits they know are bad for them. It's not like any kid wants to grow up fat and hard-of-breathing. There are many of us who do what's bad for us (and others) because we're allowed to. I don't like gov't regulation, but I also don't like having to pay for others' bad habits, and to me, driving really fast in cars that suck up gas is a bad habit. If that same car were running on farts and 2nd-hand smoke, then I'd be ok with it -- or at least ok'er with it. The speed is an issue, but for me it really comes down to the environment.
Here is a compromise: Have a lane dedicated specifically to certain speeds. I'd love a 55 mph lane. Anyone caught speeding in it would pay dearly.