added air to my tires.

[talnlnky]

I ran 32-40psi on my tires depending on the heat (32 psi during winter, up to 40 during summer), and still have very minimal tire wear after 18k miles & 1 year. Just had an oil change and the dealership said they were just over 36 (car was cold).

I'm happy to see people get so sarcastic and bent out of shape so quickly.

Reccomended by toyota is 32... bridgestone says max of 44. something in the range of 36-42 will not hurt the tires at all... I'd take bridgestone over toyota.... Bridgestone makes the tires... toyota only orders them.

in 5k if I start to have weird tread issues i'll be sure to lower the psi.. but, as said before.. .many people have gone upwards of 50psi without apparent negative effects.

[b_hickman11]

Originally Posted by voodoo22

It depends what you consider over inflating. If you consider going higher than the car manufacturers recommendations, you're wrong and if you consider going a bit over the max sidewall on newer tires you're wrong. If you mean going to 100+ psi or something like that, you may be right.

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.

Also the higher the PSI, the more mositure is in the tire which will start to break down the inside of the tire at a faster rate. This extra moisture will also reduce the life of your TPMS.

[gid]

go with the flow ....... no winning .

[mark2908]

6,000 miles at 50 lbs. (so far) and all is well. This is a Fuel Economy forum.
Flame if you must, but this is standard Hypermiling stuff and is well tested.
The stickies in this forum call for increasing psi to at least the max side wall pressure. (44 lbs.) Cleanmpg.com says the same.
This has been discussed to death both places, and it is up to the driver to decide what they want.

Lower (recommended) tire pressures are quieter and smoother but increase rolling resistance and decrease mileage.
It's also more likely to wear the outside edge of the tread as the tire slightly deforms when cornering.
Increased pressures have far less rolling resistance and less road contact, so mileage and handling is better, but it comes at a comfort cost of a rougher ride, increased road noise and harshness.
Proven by Hypermilers to wear well over time. With less deformity when cornering, the tread actually wears more evenly across the tread.
Flame away

[Smokey159]

Originally Posted by YarisSedan

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.

Leak out???? Ummm, you use nitrogen because it is less suseptible to temp change as the tire warms up.

[bigjimmysrock]

6k and you know what your talking about? the tires barely broken in....
on my truck ive got about 80k on the tires and there is still tread left! yes i do go by the tires recommended psi and agree with yall there but before we claim we know facts just give it time. as for hypermiling its great to say your getting such high mpg but im sure over the life of a car x treme hyperm. would cost you more $ from excessive wear of parts... but thats just my .02 and im egotistic a$$hole who ownes two trucks and a yaris.

[Smokey159]

Originally Posted by mark2908

6,000 miles at 50 lbs. (so far) and all is well. This is a Fuel Economy forum.
Flame if you must, but this is standard Hypermiling stuff and is well tested.
The stickies in this forum call for increasing psi to at least the max side wall pressure. (44 lbs.) Cleanmpg.com says the same.
This has been discussed to death both places, and it is up to the driver to decide what they want.

Lower (recommended) tire pressures are quieter and smoother but increase rolling resistance and decrease mileage.
It's also more likely to wear the outside edge of the tread as the tire slightly deforms when cornering.
Increased pressures have far less rolling resistance and less road contact, so mileage and handling is better, but it comes at a comfort cost of a rougher ride, increased road noise and harshness.
Proven by Hypermilers to wear well over time. With less deformity when cornering, the tread actually wears more evenly across the tread.
Flame away

Handling is better? You obviously haven't EVER gone over 100 mph. Increasing your air pressure DOES NOT increase handling. I've raced motorcycles and cars for over 5 years. You are wrong.

[bigjimmysrock]

Originally Posted by Smokey159

Leak out???? Ummm, you use nitrogen because it is less suseptible to temp change as the tire warms up.

it leaks through the rubber not the valve stem...

[bigjimmysrock]

Originally Posted by Smokey159

Handling is better? You obviously haven't EVER gone over 100 mph. Increasing your air pressure DOES NOT increase handling. I've raced motorcycles and cars for over 5 years. You are wrong.

x2

[mark2908]

Originally Posted by Smokey159

Handling is better? You obviously haven't EVER gone over 100 mph. Increasing your air pressure DOES NOT increase handling. I've raced motorcycles and cars for over 5 years. You are wrong.

Hypermilers go slow. You're right.
I would never go over 100 mph, the mileage would suck.
With less road contact, turning is tighter and more responsive.
Performance high speed driving is not the topic.

[bigjimmysrock]

do you do 80?

[rningonfumes]

I do 80mph once in a while. Most of the time, my speedometer never breaks 55mph.

I was at 50psi for about 10k and 60psi for the last 5K...I now have a total of 21k miles, just did an oil change. I agree very much with Mark.

If Bailout were to post, he would pretty much agree with Mark as well.

As for the over inflation.... have you heard of any major incidences yet? I mean all those Ford Explorer tire problems were a major part, under inflation. http://www.usatoday.com/money/autos/...y-campaign.htm

Under the things that hi-mpg people like to do, it's one of the more controversial options.
You'll find people between 45-65psi. Of course call them crazy, but no major incidences yet. Many do report longer tread life.

So...doing max sidewall is not drastic.

[mark2908]

Originally Posted by bigjimmysrock

do you do 80?

Nope. Over and out.

[BailOut]

BailOut = 60,000 miles at 50-60 PSI. Has experienced better handling, longer tread life and higher MPG. No incidents.

Collective membership at CleanMPG.com = Millions of road miles at 50-70 PSI. Folks have experienced better handling, longer tread life and higher MPG. No incidents.

A large contingent of the PriusChat membership = Millions of road miles at or slightly above max sidewall. Folks have experienced better handling, longer tread life and higher MPG. No incidents.



You guys are welcome to your wive's tales, superstitions and armchair science. The real world results are all I need.

[andries]

My winter tyres Yokohama 185/65 R15 have 36psi and my sommer tyres Yokohama 205/45 R17 have 39 psi.

[voodoo22]

Originally Posted by natethegreat38

Voodoo,
Thanks! I'm glad to know that Yokohama has wasted tens of thousands of dollars and countless hours training me on tire manufacturing, tire construction, tire conditions and more. I could have saved my company TONS of TIME AND MONEY if I had just come here and asked you about the "facts"...

By the way: an "over-inflated" tire would be one that exceeds the vehicle manufacture's recommended air pressure.

Resorting to sarcasm will not change the facts and real world experience which trump classroom theory every time.

The amount of money and time thrown at an idea does not make it true.

I've read extensively on this topic before I engaged in the practice myself. Over the course of 2 1/2 years I went from a practice of car manufacturers recommended psi, to tire manufacturers max side wall, to a little more. Now I am always around 50 psi. I am not the authority on this topic by any means, but I know what is true and what is not from seeing peoples real world results and from my own experience. If you have an open mind and really want to learn something, go and talk to real world experts at cleanmpg. They are a very mature group who present their actual experiences to you and explain why they have achieved those results.

[b_hickman11]

I have a Cousin who used to run 40 psi in his tires on a 1996 Grand AM and he had a blow out one day, which caused some damage to his left front rim and some other damage up front. When the insurance guy check it out, he tested the psi in the other tires and when he found that they were all at 40 psi, the insurance co.(which was All-State), would not pay since he was not following the manufactors psi rating of 32. So he ended having to pay about $1200 out of pocket just because he did not follow the guidelines.

[TLyttle]

Seems to me that Allstate will go to ANY lengths to avoid paying out, moreso than any other company I dealt with in the auto collision repair industry.