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Old 05-26-2011, 07:57 PM #1
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What tire pressures for best gas mileage?
I have an 04 v6 4wd Limited. Came with firestone LE's. Wish they were AT's But they were new and I am not going to change soon. What is best pressure for best mileage?
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Old 05-26-2011, 08:53 PM #2
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I run 35 on stock tyres and managed 25 MPG on CA gas. Another trip this weekend, hope for the same.
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Old 05-26-2011, 10:36 PM #3
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You really should run the pressure that gives you even tire wear. Having said that there may be a window for higher PSI and still be able to get even wear, trial and error is the only way to tell for sure. I'm running 6 ply off brand A/T's and found that 32 psi not only looked low, but also gave my V8 much worse mileage. I aired them all up to 38.5 and found my mileage shot up 2-3 mpg! I have had very good/even wear so far, so I'll keep watching and measuring the tread depth and make sure I'm not wearing in the middle more than the outside. A few more PSI shouldn't hurt, but too much will lead to uneven wear. Watch closely to keep even wear. Good luck!
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Old 05-26-2011, 10:57 PM #4
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Quote:
Originally Posted by neocacher View Post
I have an 04 v6 4wd Limited. Came with firestone LE's. Wish they were AT's Buthelezi they were new and I am not going to change soon. What is best pressure for best mileage?
I presume they have P preceeding the tire size. If it happened to be LT, it's a different discussion.

Higher psi will give higher mileage but the returns start to diminish the higher you go. If it were me and I wanted mileage, I'd run about 36-37 psi. That's not too high and I wouldn't be surprised if the tires wore better than at 32psi. Over 40psi would unduly affect handling and safety for a meager additional mpg return.
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Old 05-26-2011, 11:28 PM #5
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thanks . I will try 37 or 38
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Old 05-26-2011, 11:29 PM #6
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thanks . I will try 37 or 38.
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Old 05-27-2011, 02:12 AM #7
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38psi for me.
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Old 05-29-2011, 01:53 PM #8
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Quote:
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38psi for me.
...x2...

I'm only about to get 15mpg.
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Old 05-29-2011, 02:26 PM #9
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I was running 39 but started to get middle tread wear. Ive since been running 37 and its wearing perfectly.
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Old 05-29-2011, 03:41 PM #10
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I run 36psi in all my tires and have good results.
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Old 05-30-2011, 02:39 AM #11
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38 PSI here for most highway driving. But if you're in the 33 to 40 range, you'll do just fine. I still get most of my wear on the inside of the tire, but we're talking <1mm difference after ~60k.

If you really want to affect your MPG, then you slow down.

55-60MPH yields me 22-24 MPG
60-65MPG nets me 20-24
65-70MPG drops it down to 17-20

Basically 62MPH is my sweet spot and then terrain factors in (e.g. Sierras to Sacramento or uphill to Tahoe).
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Old 05-30-2011, 05:32 AM #12
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I use 36PSI on my 265/60 R18's with good results.
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Old 05-30-2011, 07:34 AM #13
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35 psi.
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Old 05-30-2011, 09:50 AM #14
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36 psi. in Toyo Open Country H/Ts (265/70/17) have provided me with excellent economy vs. wear.
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