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10-28-2008, 08:43 PM | #1 |
Audio Junky
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added air to my tires.
So... winter months coming... temps dropped and I noticed that my mpg's went from consistently 43+ to anything in the 40-42range. My last tank (although a small tank) was 40mpg's.
I decided that there were 3 main factors. 1: car taking longer to warm up 2: Tire pressure had dropped from 40psi in the summer months to 32psi currently 3: Due to colder temps... air resistance is higher due to the air being more dense. Can't do much about problems 1 & 3... So I pumped the tires back up to 42psi. First tank afterward netted 43.71, which is the higherst i've gotten since august 31st. Haven't noticed any difference in performance/handling or comfort either. So I'm happy with my 1-2mpg I gained back. |
10-29-2008, 07:36 AM | #2 |
Drives: Yaris Sedan (auto) Join Date: Jun 2007
Location: Toronto, Ontario
Posts: 545
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Don't forget winter gas is probably in your tank now as well. I've read where people check their tire psi weekly in the winter.
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10-30-2008, 09:16 PM | #3 |
Audio Junky
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maybe... oregon always has ethanol in the tank... has for years... so other than oxygenating it I don't know what would be different.
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10-29-2008, 12:15 PM | #4 |
Drives: 08 Sedan Join Date: Oct 2008
Location: Tyler, TX
Posts: 899
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Just get Nitrogen gas put into your tires and you wont have to worry about decreasing psi, no matter what the temp is outside. Most dealers in my area now offer this and it is usually free.
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10-30-2008, 09:15 PM | #5 |
Audio Junky
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well.... isn't air 80% nitrogen anyways?.... I'm fine for now.
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10-30-2008, 11:25 PM | #6 |
Drives: 08 Sedan Join Date: Oct 2008
Location: Tyler, TX
Posts: 899
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11-01-2008, 11:56 PM | #7 |
Need to sell my Yaris :(
Drives: 07 Yaris S Join Date: Nov 2008
Location: Douglassville, PA/Hereford, AZ
Posts: 344
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Yes it is, BUT N2 won't drop in pressure as fast as regular air, the tire pressure should stay more consistant due to there being no moisture in the N2 (with regular air you should check your pressures atleast once a month, with N2 you can go 3 to 4 before checking the pressure) AND is supposedly going to give you slightly better gas mileage as well (not completely noticable but its been told). I work in a tire and automotive shop so I work with this kind of thing all day 6 days a week. Most tire shops are starting to offer the N2 service now. Where I work its $2 per tire and then free after that. If you notice that your tires are low and you have N2 in the tires its perfectly fine to put regular air in them just when you can go back to where you got it installed and have them purge and refill with fresh N2 as the regular air will have diluted it.
ALSO on the inside panel of your driverside door read the placard, it will tell you the correct pressure that the manufacturer calls for in the tires DONT go off of what the tire says.... You could be over inflating your tires and that could cause uneven tire wear and possible hazards. (Wow I feel like I am at work lol) |
10-31-2008, 12:51 AM | #8 |
Drives: 08 Yaris Sedan Join Date: Oct 2008
Location: California - Bay Area
Posts: 2,773
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Nitrogen is denser than oxygen. Thus harder for it to leak out. With oxygen you loose about 1 pound of air per month slowly from your valve stem. With nitrogen you loose maybe 1 pound every 6 months to a year.
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10-31-2008, 11:18 PM | #9 |
Drives: Yaris Liftback Join Date: Oct 2008
Location: Lexington, KY
Posts: 55
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Leak out???? Ummm, you use nitrogen because it is less suseptible to temp change as the tire warms up.
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Can't believe I'm modding a Yaris, I must really miss my STi... |
10-31-2008, 11:24 PM | #10 |
Drives: 08 lb Join Date: Oct 2008
Location: S.A.TX
Posts: 12
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10-31-2008, 05:49 AM | #11 |
DWEED
Drives: 3DR 2008 Metorite Metalic Join Date: Oct 2008
Location: Arizona
Posts: 1,161
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I run a special mixture for my tires.
78.1% Nitrogen 20.95% Oxygen 0.038% CO2 0.0018% Neon 0.0005% Helium 0.0001% Krypton 0.00005% Hydrogen Free Nitrogen is one thing, but to pay $5 a tire like some places charge is another. I'll save my money for snake oil.
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Making a decision without following it with an action is still a fantasy. |
10-31-2008, 07:44 AM | #12 |
Drives: Yaris Sedan (auto) Join Date: Jun 2007
Location: Toronto, Ontario
Posts: 545
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It's like the bottled water craze, where often people are paying for bottle water that's even worse than the water coming from their taps.
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10-31-2008, 10:45 AM | #13 | |
Party like a Barack star
Drives: '08 LB MT Join Date: Oct 2008
Location: Cali
Posts: 288
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Quote:
Personally, MPG takes a back seat to my safety and the safety of my passengers
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i don't feel like creating another signature, yet. Give it another week... |
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11-02-2008, 12:03 AM | #14 | |
Need to sell my Yaris :(
Drives: 07 Yaris S Join Date: Nov 2008
Location: Douglassville, PA/Hereford, AZ
Posts: 344
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Quote:
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10-31-2008, 11:17 AM | #15 |
daily driver
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42psi in your tires? are they worn down the center?
damn, i ran too high of a tire pressure in my winters one time and i had to buy 2 new fronts by the end of the season (and i didnt rotate them) as they were on the wear bars down the center of the tire....
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10-31-2008, 11:21 AM | #16 |
Party like a Barack star
Drives: '08 LB MT Join Date: Oct 2008
Location: Cali
Posts: 288
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^^^ He speaks the truth... It's hard to convince people otherwise, but it doesn't save you money by over-inflating your tires; sure you get higher MPG, but you are replacing your tires more frequently offsetting the savings.
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i don't feel like creating another signature, yet. Give it another week... |
10-31-2008, 12:35 PM | #17 |
Drives: '08 Yaris sedan , '08 Liftback Join Date: Oct 2008
Location: Northeast
Posts: 643
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damage suspension as well ...
stiffer tires from overinflating can cause premature wear and tear or sudden damage on the shocks , struts , tie rod ends , etc. when hitting those potholes of winter and spring . Tires are considered part of the suspension . That's why there's a setting / limit by tire manufacturer and car maker . I can see at the most 36 p.s.i. , I try to keep them between 34 > 35 p.s.i.. This time of year is a pain the from the variation of temps . Try to check them every week if you can .
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10-31-2008, 01:45 PM | #18 | |
Drives: Yaris Sedan (auto) Join Date: Jun 2007
Location: Toronto, Ontario
Posts: 545
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Quote:
There is a growing number of people who inflate to maximum sidewall pressure and beyond with no ill affects and loads of various benefits like better MPG, handling, braking etc. Any statements to the contrary are made by people who do not know the facts. My latest pair of winters have been at a constant state of 50 psi or more and same goes for my current all seasons. I have over 40,000 combined kms on these tires and they still exhibit virtually no wear. Inflating to maximum sidewall and a little higher has only one downside and that is ride comfort, anyone telling you any different either doesn't know what they're talking about or is a liar. |
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