Tire pressure?

[etc]

Got Michelin HydroEdge. What's the best tire pressure for MPG? I put 33 psi in them.

This is 02 camry.

[TRD VVTi]

Best MPG = max inflation pressure on the side of the tire.

[desentrix]

just remember that higher psi = better gas mpg, however that comes at the price of comfort unless you have better shocks and such.

[07XLE]

You should have a sticker on your drivers door that givces you the recommended PSI for the car based on the weight of the vehicle, what does that sticker suggest?

[Mike Murrell]

Originally Posted by 07XLE

You should have a sticker on your drivers door that givces you the recommended PSI for the car based on the weight of the vehicle, what does that sticker suggest?

I find it interesting that car mfgs. and tire mfgs. have a different opinion about tire pressure.

Phone calls to Continental, Bridgestone; Michelin tech supoort have shown that what the car mfgs. post inside the door is usually way under what the tire mfgs. suggest.

[Camread]

35.9876543210123456789 psi

[TRD VVTi]

Originally Posted by Mike Murrell

I find it interesting that car mfgs. and tire mfgs. have a different opinion about tire pressure.

Phone calls to Continental, Bridgestone; Michelin tech supoort have shown that what the car mfgs. post inside the door is usually way under what the tire mfgs. suggest.

That's because car manufacturers have to take into account NVH. Tire manufacturers do not.

That's why I tell people to use the maximum tire pressure that makes them comfortable between the the cars recommended pressure and the tires max pressure.

[Mike Murrell]

Originally Posted by TRD VVTi

That's because car manufacturers have to take into account NVH. Tire manufacturers do not.

That's why I tell people to use the maximum tire pressure that makes them comfortable between the the cars recommended pressure and the tires max pressure.

TRD - thanks for the information. For those of you wondering about "NVH" - here's an overview.


http://www.frost.com/prod/servlet/ma...docid=35405241

[robob2]

^Thanks for the link, very interestnig.

[johnnyzee]

35psi, been doing it for 10+years now, perfect tire wear and handling

[kenny1773]

Originally Posted by TRD VVTi

Best MPG = max inflation pressure on the side of the tire.

but if I do that, the center of the tires wear out way before the edges do
and I get noticeably worse traction in rain


I have a formula saved in my notes on another computer, once I can get to it I will post the formula here, that I was given to help figure out what the tire pressure should be for any given car.

I remember when I ran the numbers on the camry, it was higher than what was on the door plate, but lower than the max MPG on the side of the tire. The ride seemed fine, I just can't remember the details right now.

[lammydi]

Originally Posted by johnnyzee

35psi, been doing it for 10+years now, perfect tire wear and handling

+1 on 35 psi.

[Rapid Roy]

Originally Posted by kenny1773

but if I do that, the center of the tires wear out way before the edges do
and I get noticeably worse traction in rain


I have a formula saved in my notes on another computer, once I can get to it I will post the formula here, that I was given to help figure out what the tire pressure should be for any given car.

I remember when I ran the numbers on the camry, it was higher than what was on the door plate, but lower than the max MPG on the side of the tire. The ride seemed fine, I just can't remember the details right now.

True, but the original post only asked about maximum gas mileage, not the best balance between mileage, wet traction and even tire wear.

I have run 40psi on my wifes 02 camry without crowning. I didn't notice much mileage increase, but every bit helps. Now if I can get the putzs at Costo to put more then 32 lbs into the tires life would be good.

[etc]

At 35psi, you can feel the difference from 28-30psi. The road feel is different.

[kenny1773]

Tire Pressure

(Vehicle Weight in lb/100) + 2 psi at heavier end + 2 psi all around if suspension and alignment are stock.

Example: Stock 911, 3,000 lb.
(3000/100) = 30 psi
Add 2 psi all around = 32 psi
Add 2 psi to heavy end = 34 psi at rear
With modified suspension, the result is 30 psi front, 32 psi rear.

"There is no 'golden' tire pressure"

The optimal setting depends on the individual driver and his preferences.



This is around where I run my pressure.

Camry SE I4 = roughly 3100lbs - (I rounded DOWN)
Front wheel drive assumes the front is the heavier end
Stock suspension

3100/100 = 31
+2 PSI for stock sus = 33
+2 PSI on heavy end = 35 front and 33 rear

My tires seem to be wearing ok, I have 30k miles on the stock crapstones. SLIGHT center wear happening, but not enough to worry about. If I ran them any higher the centers would burn out. It makes no sense to me to burn out the center of tires to increase fuel economy by fractions.