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TIRE AIR PRESSURE
A lot of people ask about tire pressure, if you've ever changed your tires from the EXACT stock ones,..
IGNORE THE INFO ON YOUR DOOR!
each brand has it stamped on the side of the tire,..which is good,...but it's only a starting point.
Proper tire pressure will help fuel mileage,and tire wear.
As you can see in the pic below, if you have a certain type of uneven tire wear,..this is why.
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.............Too little.............................too much......................................just right
Too little air pressure will also cause the tire to grind the plys
internally, and possibly rupture.
The PROPER way to get the pressure right is...the tire chaulk test.
For a good explanation on how to do a chalk test...click the clink
Google Image Result for http://www.jeepfan.com/tech/TirePressureChalk/TirePressureCutAway.jpg