Subaru Tech All We'll Drive

Better Gas Mileage

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Old 08-03-2006, 06:49 AM
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Default Better Gas Mileage

Found this interesting article today.

Drivers try another gas to save gasoline - Yahoo! News

Just might have to start replacing everything with carbon fiber!
Old 08-03-2006, 09:16 AM
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where the hell can you go to get nitrogen in your tires?
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Old 08-03-2006, 10:02 AM
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I'd think some of the tire places offer it. Guess it makes sense too, you'd probably save a couple bucks every time you fill up your tank (if the guy in the story is accurate that he gets an extra mile per gal).
Old 08-03-2006, 10:43 AM
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If I increased my 24mpg to 26mpg, I would save about $432 a year (assuming $3.00 a gallon).
Old 08-03-2006, 11:01 AM
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that's a decent tire or cheap mods fund.
Old 08-03-2006, 12:14 PM
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Not counting the fact that "air" is 78% nitrogen, and in terms of the periodic table, nitrogen is actually a "lighter" element than oxygen.

IMO, its like snake oil. Race teams use pure dry nitrogen in their tires not because it leaks slower, but because it yields a more predictable pressure increase as the tire heats up. Besides, heat buildup in the tire will actually increase pressure, which will reduce contact patch and therefore reduce rolling resistance.

Originally Posted by The Article
His gas mileage was about 19 mpg when he purchased his five-cylinder 2005 Chevrolet Colorado. Now, with the engine broken in and new tires filled with nitrogen, he gets 20.5 to 22 mpg depending on whether he runs the air conditioner, he said.
(emphasis mine)
Right, break in your engine and it has absolutly no effect on mileage!
Old 08-03-2006, 02:28 PM
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I am wondering what would happen if you made an underbody pan (run the whole length) and used a front skid plate and APR rear diffuser. That should lower the drag created by the car and help. It probably only works for speeds above 70mph, which would be ok for highway driving.

In the article, I think the biggest thing was that he was running 40psi in the tires.
Old 08-03-2006, 03:39 PM
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I have been running nitrogen in my wifes accord about 8 months ago. Gas mileage was really no better, not noticable or anything. But they do hold pressure very well. We have never had to add air or nitrogen to them yet. It seems the only bit that has leaked out was when I tested them.
It cost $20 for all four.
Old 08-04-2006, 12:34 PM
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Originally Posted by Syncro4ws
I have been running nitrogen in my wifes accord about 8 months ago. Gas mileage was really no better, not noticable or anything. But they do hold pressure very well. We have never had to add air or nitrogen to them yet. It seems the only bit that has leaked out was when I tested them.
It cost $20 for all four.
I've got so many screws and nails in my tires, I should have it done then!




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