i have 31/10.50/15 brigdestone duler at revo's and they have a max psi of 50 but what should i be running them at on my cherokee i have horrible gas millage hopping maybe this could help

 

Not sure that is an area you can improve if they are inflated to specs...someone correct me if im wrong. Unless you try nitrogen inflation, not sure that is even significant.

 

depends on your wear pattern. my swampers like 45 psi highway 30 psi town.

my general AT2's like 40 psi....

every tire is different go with specs. and see if it improves

 

you have a xj? with bad gas mileage? welcome to the club... I'm running 31x10.5 duratraks around 36 psi.. ijust to keep noise down, but i average around 11 mpg on a good day. i also have a lot of engine work...
its my daily driver, so its very maintained.. just a lot of highway driving...

 

keep it at least 5-10 psi below the max for proper tread wear and good mpg. Higher pressurized tires will roll easier and will improve mpg but only so far.

35-40 psi is usually the best pressure on any size. Bigger tires just mean it takes more air to fill them to that point, but it won't make them any lighter or easier to turn by adding or reducing air beyond the suggested limits. Your local tire shop should give you free tire pressure advice particular to your tire size, vehicle weight, and regular usage so you can be certain.

Its well known that a tire's air pressure can change with the seasonal temperatures it's exposed to. Either condensing in cold weather or expanding in hot, a lot of people forget to check for that and end up suffering in gas mileage and/or faster tire wear.

 

XJ are known for bad gas mileage. "Cash for cluckers" The best way I found to improve that, is get a 4 cylinder beater. And use that for work, errands, etc. The gas money you save, Throw into your XJ. I've done this for about 6 years now. For what ever SUV I owned it the time. I figured, I saved about $2500. a year in gas. Just going to work. I use my XJ for hunting, fishing, Bad weather, Towing or hauling the dogs around. So I only put about 3000 miles a year on it. I got my XJ in May of 2008, with 64,000 miles, Today it's at 70,710 miles. Not bad for a 20 year old jeep. And I plan on having it. A long, long time. At this rate it will take another 20 years to reach 150,000. Plus I saved about $60,000 in gas money. JMO!

 

Check you tire pressure at least once a week.

I ride motorcycles almost daily and tire pressure checks are critical for me.

Cherokees have not so good gas mileage on their best days, stock.

When you begin to modify them with things like heavier, larger tires you can only expect it to go down from there.

My neighbor has a DD cherokee that has multiple personalities.

He has quite a lift on it for wheeling with several sets of tires and wheels.

He has stock, car like tires for daily driving .... he runs the pressure a tad high on these and this gives him better gas mileage and the police seem to like it better as the tires look 'normal'.

He has a set of 'monster truck' like tires that suck when it comes to gas mileage but do great off road.


It might be a pain swapping out tires but he has it down to a science and because it spends more time on the road, he likes the savings the stock tires give him.

They are cheaper to replace when the time comes. When he DD'd with the off road tires he was complaining of wearing them down so fast.


Then there is the other option mentioned above ...... find a 4 cylinder XJ and use it for a daily driver. I am looking for one of those for my daughter.