tire pressure, mpg, ride quality - JeepForum.com

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post #1 of 5 Old 04-07-2010, 07:57 AM Thread Starter
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1991 YJ Wrangler 
Join Date: Dec 2009
Location: Vancouver, BC
Posts: 305
tire pressure, mpg, ride quality

I did a search and couldn't find a thread directly relating to what I'm wondering.

I bought my YJ about a month ago, and just yesterday checked the tire pressure. I figured he probably had it around 32 just based on what most people fill their tires too.

I was wrong. They were at 12 (driver side), and 10/11 (passenger side)

I have 31" Super Swampers. I've been getting about 13mpg (3.07 stock gears). I aired them up to 20 PSI this morning and my ride felt nicer, and my tires were quieter on the ground. What is the optimal tire pressure for fuel economy, comfort, and tread wear?

My tires have a 2450 lb max load rating @ 45 PSI cold. I figure I'm theoretically okay at 15 PSI, but put it at 20 to test with. I'm going to get some chalk this weekend and check to see what kind of tread pattern is actually hitting the ground. Suggestions?

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post #2 of 5 Old 04-07-2010, 08:50 AM
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Sounds like he aired down and forgot to air 'em back up....

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post #3 of 5 Old 04-07-2010, 09:00 AM
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1988 YJ Wrangler 
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Originally Posted by SpiceGirl View Post
Sounds like he aired down and forgot to air 'em back up....

My first thought too

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post #4 of 5 Old 04-07-2010, 09:10 AM Thread Starter
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1991 YJ Wrangler 
Join Date: Dec 2009
Location: Vancouver, BC
Posts: 305
Yeah kinda what I figured too. I know he went wheeling in it not long before he sold it, I guess that just makes the PO a knob (and myself too, for not checking it sooner).
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post #5 of 5 Old 04-07-2010, 10:09 AM
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1993 YJ Wrangler 
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Location: Greenfield
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I run 40 PSI in my 31's with no sway/track bar and old as hell springs that are pretty much shot. My ride is pretty smooth.
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