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Speed limit comes under fire
Talk of a return to 55 mph incites debate
Intelligencer Journal
Published: Jul 25, 2008
01:20 EST
Lancaster
By DAVE PIDGEON, Staff
Having a national speed limit of 55 mph to help reduce gasoline prices is a "hare-brained" scheme that would line the pockets of local government and insurance companies, a Pennsylvania-based motorist group said Thursday.
Route 222 traffic on a section of the highway marked 65 mph.
 
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"If you want to drive slower, go ahead and drive slower," said Tom McCrarey, a spokesman for National Motorists Association, based in Devon. "But don't make everybody else drive slower."

Putting a 55-mph cap on speed limits would lead to more speeding tickets, which would financially benefit local municipalities as they collect fines, McCrarey said. It also would provide a windfall for auto insurance companies, which can increase premiums and collect surcharges on every ticket.

"Insurance companies are behind this," he said.

McCrarey was reacting to U.S. Sen. John Warner's comments from earlier this month about reinstituting a 55-mph national speed cap, a law that was rescinded in the mid-1990s.

Warner, a Virginia Republican, cited studies illustrating how driving less than 60 mph improves a vehicle's fuel efficiency and could save 4,000 lives annually across the country.

According to the U.S. Department of Energy, every 5 miles a motorist drives faster than 60 mph adds about another 30 cents a gallon to fuel costs.

Warner's suggestion, if followed by most motorists, would theoretically mean a downturn in American demand for oil and, consequently, a downturn in domestic gasoline prices.

Gasoline prices are, on average, nearly $1.10 per gallon above what they were at this time last year, according to the U.S. Energy Information Association. AAA reported Thursday that the average price of regular gasoline was $4.03 per gallon.
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The price spike is the result of fast-rising worldwide demand for crude oil. According to the U.S. Energy Information Association, crude oil constitutes about 74 percent of each gallon of gasoline.

When an Arab oil embargo in the early 1970s drove up the price of gasoline, the federal government introduced the 55- mph speed limit. The feds repealed the limit in 1995, when crude oil cost $17 per barrel and the price of a gallon of gasoline was $1.10, according to The Associated Press.

"Given the significant increase in the number of vehicles on America's highway system from 1974 to 2008, one could assume that the amount of fuel that could be conserved today is far greater," Warner wrote in a letter to Energy Secretary Samuel Bodman, the AP reported.

McCrarey said there's nothing to prevent a driver now from traveling 55 mph "as long as they stay in the right-hand lane and let faster traffic pass on the left."

However, he said, imposing a 55-mph speed limit could lead to more traffic deaths because many motorists would continue driving above 55 mph, making slower traffic hazardous.

"Speed doesn't kill," he said. "Difference in speed kills."

To lower gas prices, the United States would be better off expanding domestic drilling, McCrarey said.

However, according to several news reports, it would take a long time to search across thousands of square miles of ocean and land for possible oil wells, then build facilities to extract that oil.

And according to www.marketwatch.com, "Recent studies by the Bush Administration's own Energy Information Administration (EIA) have shown that expanded drilling offshore and in the (Arctic National Wildlife Refuge) would have little impact on supply before 2030 and an 'insignificant' impact on prices at the pump."

Meanwhile, there appears to be no movement in Harrisburg to reduce Pennsylvania's speed limit from 65 mph to 55 mph.

"As of today, there have been no bills introduced in the House and I've heard of no action (elsewhere)," said state Rep. Dave Hickernell, a Lancaster County Republican who serves on the House Transportation Committee.

E-mail: dpidgeon@lnpnews.com

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QUOTE(bus driver @ Jul 28 2008, 10:02 AM)
I have noticed with gas prices being high, I get better milage when I am driving compared to when my hubby drives.

I've noticed a difference too. I haven't kept track of the numbers, but the gas lasts longer when I drive. I try to be more smooth with the gas and brake while he on the other hand tromps both. It's a wonder I don't have whiplash somedays. Of course it's because he's not used to the pedals .

twinmom
The gf gives me that too. Somehow she never notices the negative gas mileage, when the gauge goes up from where it was when I hand her back the keys. Well, sometimes she does. But she always notices when she gives me the car with the needle just barely touching the pin and I give it back to her with the needle just barely off the pin.
solitary
QUOTE
Never believed 55 saved gas. Once the vehicle is in drive or high gear, the engine is coupled to the rear at 1:1, or better in the case of overdrive. Distance travelled is equal to the number of engine revolutions. If that engine is going fast or slow makes little difference. There is increased wind drag with speed, to a point. Modern cars are pretty slick in the wind. After a point, it actually helps push, ask NASCAR.


Sorry, that's not true at all. Engines produce different rates of power per unit of fuel consumed depending on RPM and torque output. This is charted on a brake specific fuel consumption or BSFC map. Most engines do best at around 60% load at low RPM. However, because most cars sold in North America have more power than they'll ever need, highway cruising happens at around the 15-30% power levels depending on incline and speed. Working opposite to the BSFC map is that aerodynamic drag has a exponential relationship to speed. This is why driving at 80mph uses significantly more fuel than driving at 55mph. I do have MPG instrumentation and my small 2 door coupe does its best of 43mpg at 53mph.

Spoiler drag never helps push a car. It robs some of the forward energy and directs it downwards to keep the tires planted on the road surface. This is why formula one cars can pull about 2G's on high speed corners where they'd only be able to pull around 1G at lower speeds.
Subsonix
"Spoiler drag never helps push a car" Subsonix
Never said it did. I'm referring to the push on the flattish backend. Why do you suppose most new cars have the trunk deck so high you can't see out the back window? To take advantage of that. Ever see a duck swim upstream?
You have done the numbers for your combination, good. That will not work for my combination. I have read plenty, ever heard of Smokey Yunnick? 60% load at low RPM? I'm talking V8. Engine efficiency greatest at about 3/4 RPM ability of the engine, whatever the load. Overcoming frictional losses inside the engine is the game.
I use the middle grade, because that's where I get the best mileage per buck. I have carburetors on both my vehicles. I'm not crying about gas, as I long ago figured it as cost of doing business. Now, my "wants to roll at 60" car comes up behind your "60% at low RPM" driving style.
Solitary, I consider speed limits arbitrary. I am licensed to operate the vehicle, insured, can make a number of choices that impact the safe operation, and now they want to tell me how fast I can go? All of a sudden my judgement is no good? Baaaaahhh!
The car I'm building will have a "highway" gear ratio to get some better mileage.

Has anyone tried acetone?

Whirlwind
QUOTE

You have done the numbers for your combination, good. That will not work for my combination. I have read plenty, ever heard of Smokey Yunnick? 60% load at low RPM? I'm talking V8. Engine efficiency greatest at about 3/4 RPM ability of the engine, whatever the load. Overcoming frictional losses inside the engine is the game.


Engine torque (volumetric efficiency) might be greatest around 75% of redline, but fuel efficiency is not. The goal is to keep load as high as possible while maintaining speed, and you have to do that in a high gear at low RPM.
Subsonix
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