
This is simply something I wrote as a matter of opinion. Take it or leave it but feel free to make yourself heard. Enjoy. 
You may recall during the summer when gasoline prices spiked and approached $5 per gallon in some places, all the tree-hugging nutjobs and politicians to whom their strings are attached began screaming bloody murder. Amidst their idiotic and incoherent blathering was the suggestion that now was a better time than ever to bring back the National Speed Limit.
For those of you who don't remember, from 1973 to 1995 the highest speed limit allowed on any type of federally-funded road in the United States was 55 mph. That is, of course, if the states wanted federal highway funds. Sure you could sign a road at 70 mph but then you wouldn't see a cent in maintenance funds for your Interstates. It's easy to see why states bowed to the pressure.
It began in 1973 during the final full year of the Nixon administration and at the start of the Arab Oil Embargo. At the time, it was seen as a way to increase fuel efficiency in a gas shortage and to reduce fatalities. And it worked....for a very short while.
It didn't take long for drivers to realize that 55 was pretty damn slow and people took to speeding. The limit was unpopular enough to have the hit song "I Can't Drive 55" written about it by rocker Sammy Hagar. Naturally, Hagar was struck with the inspiration to write the song while he was being cited by a New York State Trooper for going 61 mph in a 55 on an empty stretch of rural New York Interstate in the early morning hours. Given Hagar's prior citations for speeding that continue to this day, I'd say he was definitely behaving himself.
To further discourage speeding, the Fed mandated (starting in September, 1979) that all cars sold in the United States have a speedometer that read no higher than 85 mph and have 55 clearly marked. The restriction didn't last and was repealed in March, 1982 although many cars sold in the U.S. up to the 1995 model year continued to have their speedometers indicate 55 in a stand-out color (usually red).
In fact, according to the Federal Government, the same entity that forced the double-nickel limit upon American drivers, rated that disobedience of the NSL was around 83% on rural interstates (meaning only 17 out of every 100 cars was going 55). And when it was all said and done, independent research estimated that the total fuel savings might have been no greater than 0.5% annually.
For you non math types, here is a hypothetical scenario. If all vehicles in a state in the year 1985 were to hypothetically consume 1,625,000,000 gallons of fuel (12.5 gallons per week, 2.5 million cars in the state) your savings would be a mere 8,125,000 gallons. Now that may sound like a lot but that's enough to send each of those 2.5 million cars (at 22 mpg) a mere 0.15 miles extra a year.
That's 792 feet further...less than three football fields.
It was not until 22 years after its inception that the National Speed Limit was repealed (in 1995) and the government handed control of speed limits back to the states. Since then, Texas has even instated an 80 mph speed limit on rural sections of Interstate 10 in West Texas, a trend Utah is following as an experiment. Some people may call this crazy but the maximum speed limit in Europe is 130 kph (80 mph) barring, of course, the sections of the German Autobahn that do not have speed restrictions. Keep in mind, that Europe is much more densely packed than West Texas. There's some food for thought.
The 55 mph speed limit is an antiquated thought process that effectively turned America into a nation of lawbreakers. Modern cars are far safer and more fuel efficient than they were in 1973 and this notion of losing 10% fuel efficiency for every 10 mph over 60 you go is baloney as well. My 2004 Hyundai Santa Fe is rated for 24 highway but while cruising at 75 mph, I got 25.7 mpg and that was with the A/C on in the middle of the desert in June! I dropped it to 70 and my mileage dropped also to a mere 20 mpg...hmm.
Honestly, keep the speed limits where they are (but bring Oregon up to 70 for God's sake). If people want to drive 55 and feel better about themselves, let them do it. Just make sure they stay in the right hand lane where they belong.