Changing your driving style is best, i can get around 300 miles out of a tank driving normally, but squeeze up to 450 miles if I put a bit of effort into driving gently, and my tops tips are:

1. Keep speed down on open roads, below 60, nearer 50 if your car isn’t aerodynamic.
2. Try to keep revs between 1500-2500 on a petrol engine, maybe 3000 max for cruising.
3. You don’t need to accelerate slowly, do it briskly with low revs, give at least 2/3 gas and stay below 2500 and the engine will be breathing well on an mostly open throttle.
4. Anticipate, every press of the brakes is wasted fuel, of course you have to stop for red lights, but drive in a way that avoids the need to brake in the first place.
5. Higher octane fuels can give better economy on some modern fuel injection cars
6. Short journeys are fuel hungry for the distance, up to 3 times more than just cruising at 50-60. Idling is 0mpg, avoid it.
7. Keep excess weight out of the car, tyre pressures at recommended, air con off, electrics to minimum.

Ok I see what you mean about EPA results, but they are not additives and devices of the type i was thinking, the best performing are engine upgrades. These are individual to your car engine, depends where the manufacturer had to make compromises in performance over reliability or emissions. Things like over the counter petrol and oil additives and other minor things will not usually pay back the investment even though they might actually improve economy.

But you’ll notice a lot of the good EPA results apply to changes to carburettor cars / non electronic ignition which weren’t as good at economy anyway, that’s why fuel injection replaced them to meet stringent laws.

In that case you are best looking at proper upgrades. Other sensors / ECU may need to be changed on modern fuel injection so the car can understand the changes:

1. Any kind of upgrade to air intake can sometimes improve economy by reducing pumping losses and providing more oxygen, a complete replacement may give noticeable results.

2. More powerful ignition, full upgrade to coil pack / sparks / igntion module / ECU

3. Exhaust manifold and system changes, noiser exhaust can also be more economical.

16. If your companions suddenly begin to exhibit uncharacteristic behavior such as hissing, fascination for blood, glowing eyes, increasing hairiness, and so on, get away from them as fast as possible.

15. Do not search the basement, especially if the power has just gone out.

14. Beware of strangers bearing tools such as chainsaws, staple guns, hedge trimmers, electric carving knives, combines, lawnmowers, butane torches, soldering irons, band saws, or any device made from deceased companions.

13. If appliances start operating by themselves, move out.

12. Stay away from certain geographical locations, some of which are listed here: Amityville, Elm Street, Transylvania, Nilbog (you’re in trouble if you recognize this one), the Bermuda Triangle, or any small town in Maine.

11. If your children speak to you in Latin or any other language which they should not know or if they speak to you using a voice which is other than their own, shoot them immediately. It will save you a lot of grief in the long run. NOTE: It will probably take several hundred rounds to kill them, so be prepared!

10. If you’re running from the monster, expect to trip or fall down at least twice, more if you are of the female persuasion. Also note that, despite the fact that you are running and the monster is merely shambling along, it’s still moving fast enough to catch up with you.

9. When you have the benefit of numbers, *never* pair off and go it alone.

8. Do not take *anything* from the dead.

7. As a general rule, don’t solve puzzles that open portals to Hell.

6. Don’t fool with recombinant DNA technology unless you’re sure you know what you are doing.

5. Never stand in, on, above, below, beside, or anywhere near a grave, tomb, crypt, mausoleum, or other house of the dead.

4. Never read a book of demon summoning aloud, even as a joke.

3. If your car runs out of gas at night, do not go to the nearby deserted-looking house to phone for help.

2. If you’re searching for something which caused a noise and find out that it’s just the cat, *leave the room immediately if you value your life.*

and last but not least…

1. If you find a town which looks deserted, it’s probably for a reason. Take the hint and stay away!
star if funny

ha ha ha funny

But the synthetic tree proposed by Dr Klaus Lackner proposes does not much resemble the leafy variety.

"It looks like a goal post with Venetian blinds," said the Columbia University physicist, referring to his sketch at the annual AAAS meeting in Denver, Colorado.

But the synthetic tree would do the job of a real tree, he said. It would draw carbon dioxide out of the air, as plants do during photosynthesis, but retain the carbon and not release oxygen.

If done to scale, according to Dr Lackner, synthetic trees could help clean up an atmosphere grown heavy with carbon dioxide, the most abundant gas produced by humans and implicated in climate warming.

He predicts that one synthetic tree could remove 90,000 tonnes of CO2 in a year – the emissions equivalent of 15,000 cars.

"You can be a thousand times better than a living tree," he said.

Carbon sinks

For now, the synthetic tree is still a paper idea. But Dr Lackner is serious about developing a working model. His efforts suggest the wide net of ideas cast by scientists as they face the challenge of mitigating climate change.

Dr Lackner believes that carbon sequestration technology must be part of the long-term solution. Global reliance on fossil fuels will not decrease any time soon, he said, and developing countries cannot be expected to wait until alternatives are available.

The technology calls for two things – seizing carbon and then storing it. Direct capture of CO2, from power plants for example, is the simplest, according to Dr Lackner. But this doesn’t work for all polluters. A car can’t capture and store its carbon dioxide on-board; the storage tank would be too large.

"It’s simply a question of weight," he said, "for every 14 grams of gasoline you use, you are going to have 44 grams of CO2."

The alternative is to capture emissions from the wind. In this case, a synthetic tree would act like a filter. An absorbent coating, such as limewater, on its slats or "leaves" would seize carbon dioxide and retain the carbon.

Dr Lackner predicts that the biggest expense would be in recycling the absorber material.

"We have to keep the absorbent surfaces refreshed because they will very rapidly fill up with carbon dioxide," he said. If an alkaline solution such as limewater were used, the resulting coat of limestone would need to be removed.

Dr Lackner is considering other less-alkaline solutions to prevent carbonate precipitation.

"There are a number of engineering issues which need to be worked out," he said.

Home use

A synthetic tree could be planted anywhere. A small one could sit like a TV on the lawn to balance out the CO2 emitted by one person or family.

But more practically, said Dr Lackner, a device the size of a barn would sit in the open air, near repositories for easy transportation and storage of carbon.

He estimated that 250,000 synthetic trees worldwide would be needed to soak up the 22 billion tons of CO2 produced annually.

But not everyone is rooted to the idea. Massachusetts Institute of Technology engineer Howard Herzog thinks Dr Lackner’s design won’t hold together on the scale he proposes.

He said you would expend more energy in capturing the CO2 – in keeping the slats coated in absorbent and disposing of it – than you’d save.

"Once the solvent captures the CO2, it holds it on tight," said Dr Herzog, "and it’s going to take a lot of energy to break those bonds."

He said that much more research is needed on the technology.

"The idea of air capture is seductive and would really be great to have," said Dr Herzog, "but it’s important to separate out the concept from the technical details."

‘Early days’

Meanwhile, Dr Lackner is pursuing his idea for carbon storage. While he was at the US Department of Energy’s Los Alamos National Laboratory, his team worked on a storage method based on a natural chemical process known as rock weathering.

When CO2 binds with magnesium, it creates carbonate rocks which, according to Dr Lackner, retain carbon permanently and safely.

Currently, he said, the process is still too expensive to develop on a large scale.

But Dr Lackner is optimistic that the costs for carbon capture and storage will come down.

"This is still the early days of climate solutions," he said.

Just to add – the report is a bit out of date. Since it was written the scheme has been trialed on a small scale and the chemistry has evolved. There is also a similar proposal by Dr David Keith

The current proposal for Prof Lackner’s method is to use sodium hydroxide, this reacts with the CO2 in the air. The NaOH can be recovered for reuse and the byproduct used as synthetic fuel.

There’s more about the chemical processes and the two schemes in a previous answer I provided to a similar question – http://answers.yahoo.com/question/index;_ylt=AmcxWxraYWy4WH2VFGCA0h0jzKIX;_ylv=3?qid=20070822201803AAFxofS

Icecaps are melting
Grass is Going dead
All this is spinning
Inside my head

People driving cars
Don’t seem to care
As gas and Pollution
Fill up the air

We walk on the ground
And just step on the flowers
We don’t realize that because of us
They only have hours

We take nature for granted
And say, "Oh, it’ll grow back"
Without realizing
It’s under attack

I hope we can be saved
Before we all die
All I have to ask
Is simply, "Why?"
is rhyme a literary device?

alliteration "grass is going"
enjambment (breaking up sentences between lines)
yes, rhyme is a device