What PSI are your tires? (Poll)

Discussion in 'Fuel Economy' started by lamebums, May 11, 2008.


How many PSI are your tires?

  1. Under 35

    24 vote(s)
  2. 35 to 39

    46 vote(s)
  3. 40 to 44

    115 vote(s)
  4. 45 to 49

    38 vote(s)
  5. 50 to 54

    56 vote(s)
  6. 55 to 59

    11 vote(s)
  7. 60 to 64

    13 vote(s)
  8. 65 to 69

    4 vote(s)
  9. 70 to 74

    3 vote(s)
  10. 75 or higher

    7 vote(s)
  1. CapriRacer

    CapriRacer Well-Known Member

    True about the use of the ramps, but it is also true that lower tire pressures tend to decrease the propensity for the vehicle to tip over. The trick is a lot easier to initiate if the tires are that hard!

    But not quite true about about max FE not taking you near a car's tip over point. That's not the point. Accidents happen and sometimes vehicles tip over - even low slung sports cars - and overinflated tires help the vehicle to tip over once its started.
  2. diamondlarry

    diamondlarry Super MPG Man/god :D

    You seem to have missed my point which was, if you are driving for maximum FE, you will not be putting yourself in situations that would take you to the point of possible rollover in the first place.
  3. mintsk8er

    mintsk8er Well-Known Member

    For truth. I was demoing my SGII to a friend and explaining the "previous day" feature to show him what hypermiler stats actually look like :D. He thought it funny that my max RPM was no more than a hair higher than 2300 RPM for the entire day :eek:.
  4. dobsont

    dobsont "How's your mileage?"

    48# in 44# hydroedges. They're hard anyway, so its a good coastable combination...
  5. Ernie Rogers

    Ernie Rogers Member

    Okay, 5 pages of mostly positive. Now, how about the negative experiences?

    I had to replace a Michelin Energy MXV4 Plus tire due to tread separation. The tire was still fairly new with good tread. I had been pressurizing to about 42 psi (44 sidewall). The failure occurred not so long after a drive through Las Vegas at 110 deg. F.

    We probably all realize that tire pressures change from where we set them, sometimes going higher. The max sidewall pressure applies to the tire at ambient temperature. (That technically means you haven't driven the car, or had it sitting in the sun.) The tire pressure rises a little in running, and that is expected. But--

    If you set the pressure in the cool of the morning and then drive on a hot afternoon, the pressure can be quite a bit higher than you think. Somebody can check my calculation--here is the rule. Tire pressure increases by one psi for each 10 deg F of temperature rise.

    Ernie Rogers
  6. xcel

    xcel PZEV, there's nothing like it :) Staff Member

    Hi Ernie:

    ___Been running 65 in my Accord’s Michelin MXV4 Plus’ for over 3 years now in temps from 110 to minus 15 degrees F. 100,000 miles and still have 3/32 up front, 5/32 in the rear with even wear all across. Refilled ~ once a month just to make sure as well.

    ___Good Luck

    Last edited: May 26, 2008
  7. warthog1984

    warthog1984 Well-Known Member

    That's called a delamination and is a manufacturing defect rather than anything related to inflation.
  8. Zukiru

    Zukiru 0.29 coefficient of drag

    rough ride at 44

    will goinging taller/shorter on my next set make a difference.. my poor 80s subie is going to rattle apart at this rate.
  9. HemiSync

    HemiSync Well-Known Member

    That is close to accurate from my recent experience, but probably not a huge reason for failure. Before I drove to Florida recently I check my tire pressure in the cool wee hours of a Pennsylvania morning at 55psi with temp of about 45F. When I got to Florida, I had been driving that last segment of the route of 329 mi in 90F heat. When I pulled into my parent's driveway, one of the first things I did was check my tire pressure because I was concerned about what the temp change & long distance driving would do to them coming from cool weather to warm. The tires were all just under 60psi and when allowed to cool down from the driving, the next morning they were 58psi. Ran them for the entire week I was down there with no problems & upon returning home they were back to the original 55psi. So while tires pressure does fluctuate with ambient & surface temps, it isn't that much of a concern.

  10. lamebums

    lamebums Member

    What about elevation changes, I'm curious? I'm running mine at 55 PSI on max sidewall 44, but a trip to Philly and back includes driving through the mountains, sometimes up to 3,000 feet from what is otherwise almost sea level.

    What bearing would that have on tire pressure?
  11. e.powell01

    e.powell01 Member

    I just purchased a used 2003 Chevy 1/2 ton Express Conversion van for family and Scuba diving trips. So my vehicles sit all week because I drive a company 2003 Express 1 ton van. How do I know where to stop at for the inflation levels? I know the sticker in the door shows 35# front & rear. The van has 295/60-16 BFG radial TA's. Wide tires! This van being a conversion is fully loaded with seating for 7. So it has some weight to it.


  12. Akpsdvan

    Akpsdvan Banned

    What does it say on the side of the tires?
  13. WhatIsChazaq

    WhatIsChazaq Active Member

    The Blubaru is manufacturer "recommended" for 28 in the rear and 29 up front.

    Max Pressure on the Michelin Destiny tires are 44.

    I keep them at...

    Last edited: Jun 2, 2008
  14. e.powell01

    e.powell01 Member

    I would need to look again. But I believe it is 35?
  15. Parasite

    Parasite Well-Known Member

    It would really be barimetric pressure. A lower pressure like in a storm or higher elevation would cause the same amount of air in your tire to be at a "higher" pressure. Two PSI equals one inch Hg, so it is pretty minor.
  16. xcel

    xcel PZEV, there's nothing like it :) Staff Member

    Hi All:

    ___40% above max and 350% below burst ;)

    ___Good Luck

  17. kayasbluetaco

    kayasbluetaco Well-Known Member

    My tires suggest 44 psi, so that is what I put them at.
  18. I am getting the oil changed tomorrow and asked them to set the air pressure to the sidewall max pressure. The guy said he would but wanted me to know that it would wear out the tire quicker? It seems to me that it would be better on tire wear with less friction. Is he right, or just another bozo at a car dealership.
  19. diamondlarry

    diamondlarry Super MPG Man/god :D

    Tell him about the original tires on Wayne's '05 Accord that have 95K+ on them and they have been at 50+psi the whole time.
  20. e.powell01

    e.powell01 Member

    Anyone want to give a recommendation/s? I correct my last entry the tires are BFGoodrich Radial TA's 285/60-16. Max sidewall 35 PSI. It's on a 2003 Chevy 1500 Express Conversion van.

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