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Old 07-14-2004, 07:22 AM   #1 (permalink)
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Higher tire pressure for better gas mileage

Some where I read that stiffer tires gave better mileage. So I put extra 5 PSI on all 4 tires, and the rear suspension rides fine. However, I could felt road impections from the front. Will there be a problem driving such in a long term? On some of the newly paved road, the car rides very well.

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Old 07-14-2004, 07:49 AM   #2 (permalink)
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RE: Higher tire pressure for better gas mileage

Usually car makers recommend lower tyre pressure than would be standard, this is done to keep things a little less noisier and a little more comfortable. A few more PSI does improve gas mileage, but watch out for over inflation because this will cause your tyres to balloon out causing uneven wear.

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Old 07-14-2004, 08:32 AM   #3 (permalink)
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RE: Higher tire pressure for better gas mileage

On the inside of the fuel filler door is a sticker with recommended inflation pressures. You will notice it states that for speeds in excess of 100 MPH + 6 PSI. Obviously there is cause for increased tire pressures but ride quality suffers as the tires get "harder" with increased air pressures. [8D]
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Old 07-14-2004, 04:44 PM   #4 (permalink)
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RE: Higher tire pressure for better gas mileage

The title of your thread should be: “Higher tire pressure for uneven tread wear.� [:(]
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Old 07-14-2004, 05:52 PM   #5 (permalink)
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RE: Higher tire pressure for better gas mileage

I keep my tires about 5PSI higher than recommended for better milage, while driving higher speeds frequently on the highway and better handling on turns, just don't go any higher than 5PSI more.

And in the winter, its better to defalte them a little, better traction on snow etc...
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Old 07-14-2004, 08:18 PM   #6 (permalink)
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RE: Higher tire pressure for better gas mileage

Tire pressures again...hmmm....I try to run manufactures spec on the gas flap, but some times it just burns to much fuel. Comfort wise it's nice but turning response is sometimes less. Just out of curiosity I wonder what W140's run?
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Old 07-15-2004, 02:28 AM   #7 (permalink)
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RE: Higher tire pressure for better gas mileage

Quote:
NewMBie - 7/14/2004 10:22 AM

Some where I read that stiffer tires gave better mileage. So I put extra 5 PSI on all 4 tires, and the rear suspension rides fine. However, I could felt road impections from the front. Will there be a problem driving such in a long term? On some of the newly paved road, the car rides very well.
If the center tread portion begins to wear before the heels [outer tread corners] the tires are too much overinflated...

At no time is it recommended to exceed manufactures tire pressure warnings...

Surprisingly they are not the same for same exact tire sizes... [some may be 35psi others might be as high as 51psi... maximum allowable pressures]

51psi = "hard as a creek rock theory..."
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Old 07-16-2004, 09:09 AM   #8 (permalink)
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RE: Higher tire pressure for better gas mileage

Well, if you look in your gas cap it will give you recomended inflation levels..I do beleive it also says that for driving over 100MPH to increase pressure by 6 or 9psi..

If you want to Really get into it, run some higher pressure AND use nitrogen to inflate your tires. Much better for your rims and gives about 20% better tread wear in fleets.

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Old 07-16-2004, 11:10 AM   #9 (permalink)
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RE: Higher tire pressure for better gas mileage

opening the gas cap and reading the label is ok if you have the "stock" tire size on the car, but if its any other size then ask a proper tech about what PSI you should have in accordance with the weight of the car, my tires (different than stock) read 40PSI, so thats what I put, even if the gas cap reads different
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