Tire Air Pressure to 40psi

[sarasotavince]

I have been reading some owners are bumping the pressure to 40 psi in an effort to get better mpg. Ok, what's the downside?

[schmidtj]

Originally Posted by sarasotavince

I have been reading some owners are bumping the pressure to 40 psi in an effort to get better mpg. Ok, what's the downside?

Less tire "footprint" in contact with the pavement resulting in longer stopping distances, more wear in center of the tread. Rougher ride and more wear and tear on front end components.
.
.
.J

[sarasotavince]

Is all of that worth an extra mile or so (???) a gallon? I'm told those tires are 175.00 a piece....

[herbQ]

I figure the Toyota and Michelin folks know much more about their products and usage than I do. I prefer to go with their numbers and not worry about squeezing a little more mileage out. At 7,000 miles the car is at 43mpg with the stock settings.

[utkan]

Originally Posted by sarasotavince

Is all of that worth an extra mile or so (???) a gallon? I'm told those tires are 175.00 a piece....

Where do you get your tires! $175 for 216/60r16 no way

They sould go with 4 spares and they will get the best mps

[LifeTech]

Originally Posted by sarasotavince

I have been reading some owners are bumping the pressure to 40 psi in an effort to get better mpg. Ok, what's the downside?

I have a better idea, I hear others are using no air at all, just fart juice. It's free like air. But if yu fart till till it reaches 120 psi yu will get 79MPG.

And If yu don't have any, I will send it free, just pay shipping is all I ask.
Since yu are a member I will not charge yu a handling fee!

Toyota doesn't want yu to know about these anal tricks. They want yu to use the sticker in the door jamb for the PSI recommendation. How dare they put such stickers there with obvious "wrong" info!

Pardon my spelling.

[currybob]

I run the 40 psi on recommendation from an mechanical engineer (he works for Micheline) . The difference between what is recommended is only 4 psi yet the tire drag reduction is around 15%. I have not notice any change in the ride.

Bob

[schmidtj]

Originally Posted by currybob

I run the 40 psi on recommendation from an mechanical engineer (he works for Micheline) . The difference between what is recommended is only 4 psi yet the tire drag reduction is around 15%. I have not notice any change in the ride.

Bob

I cranked mine up to 40psi for a weekend trip. I can now run over a dime and tell if it's heads or tails.

[LifeTech]

Originally Posted by currybob

I run the 40 psi on recommendation from an mechanical engineer (he works for Micheline) . The difference between what is recommended is only 4 psi yet the tire drag reduction is around 15%. I have not notice any change in the ride.

Bob

I work for Michelin as a Technical Design Consultant in R & D and your 15% figure is incorrect. Study basic calculus...it will help yu arrive at a more accurate figure.

Come on ...you're splitting hairs. Get a life.

[currybob]

The statement is "reduces tire drag". The tire drag coefficient is reduced by 15% and the math works. Tire pressure is increased by 12%, re-check your figures.

Got a life!!

Bob

[LifeTech]

Originally Posted by currybob

The statement is "reduces tire drag". The tire drag coefficient is reduced by 15% and the math works. Tire pressure is increased by 12%, re-check your figures.

Got a life!!

Bob

"TPC"...does this acronym ring a bell?
"Tire Performance Criteria" (Toyotas spec for the tire on your vehicle)

YU are exceeding your tires limits for a neglible net gain that is insignicant.

And, at the sacrifice of saftey, performance, and tire wear.

• Force & Moment
• Residual Aligning Torque (RAT)
• Rolling Resistance
• Braking Traction
• Driving Traction
• Uniformity
• Noise
• Dimensions
• Mass
• Rev/KM
• High Speed
• Air Retention
• Electrical Resistance
• Automatic Mounting
• Endurance (ATE)
• Treadwear
• Chip/tear
• Groove Wander
• Ride & Handling
• Wet/Snow Handling

Consider the above criteria as spec'd by Toyota.
Your theory impacts the above criteria, yu are exceeding the limits of the tire design. Altering the load range spec. too much.

Plain and simple... If yu advocate your PSI to others, make sure yu explain that it can be hazardous and not safe for some vehicles...

I know much about Tires. I don't brag much about anything. But Tires IS my passion. I will brag about my knowledge of them if need be just to prove my point. When we can both communicate in tire talk then we can debate further, using the same language.
I'm not into simple Rants. Or, Tit For Tat either.

Now analyze this and the Life yu say YOU have.



LT

[currybob]

LT

Thanks for the info.

However, I have Micheline's Energy and stamped on the tires it states "max pressure is 44 lbs". Apparently one of the worlds largest tire manufactures saw fit to decrease tire drag for better fuel efficiencies. Therefore I am not exceeding the design limits of the tire. Think I will add 4 more lbs and see if I notice a difference.

It's a well know fact a high percentage of cars on the road are running on lower tire pressure than what is recommended. This, as you know, causes lots of it own problems.

What tires are on you car?

Bob

[fcatwo]

A tire dealer on another forum reported that he has seen tire failures caused by extreme overinflation. Theory is that the rubber and fabric plies stretch causing small separations at edge of steel belt -- and resulting in eventual loss of tread. No scientific proof but worth thinking about.

[tacomatrdsport2591]

Hmmmmm....

..44psi.
..splitting hairs
..fart juice



..hmmmm

[rtb3rd]

I'm typing this just to see how "quick reply" works. NOT to say that the people I've met who know the most about what they're talking about don't need to say so. ;-)