Tire PSI & MPGs

[onfire392]

I like my tires to wear evenly. 37psi cold per manufacture wears the center out. Yes you get better MPG but tires do not wear properly.

I found for my 24 392 that 32 front and 30 rear has better road contact and even wear. I tried 34 from and 32 rear and front was ok not perfect but rear contact path was not as good as 30psi - cold. Jeep is sock on stock OEM BFG tires.

I’m at 32/30 as well cold. Does a cold 28 set the dash warning ?

 

[guruman]

I’m at 32/30 as well cold. Does a cold 28 set the dash warning ?

I've used the Taser to lower the alert limit... other wise, I think it would.

 

[Jeepstin392]

45 psi would ride like a rock 17 on the Hwy was the best I ever got 15 is average. I run 35s at 32 psi (nitto trail grapplers c rated)

I don’t drive it daily. And mostly around town. I did think it was riding rougher, but e range feels like rocks even at 30 psi.

 

[@WhiteBronze392]

I’m at 28.5psi and got 16.7mpg on my 3 hour roadtrip back from jeep beach (didn’t think to check on the way there) otherwise around town I’m usually at about 9.5mpg

 

[Tank2112]

I found on my custom rock Jeep with 42" tires...it not being a daily driver, sometimes it sits for weeks or more... that if I put more air pressure in tires, they won't flat spot as bad. So if I know it will sit for a couple of months, I air up closer to 40 psi.

 

[ParadigmDawg]

I’m at 28.5psi and got 16.7mpg on my 3 hour roadtrip back from jeep beach (didn’t think to check on the way there) otherwise around town I’m usually at about 9.5mpg

That is about where I'm at but I have seen a brief 14 mpg on the highway as my best.

 

[@WhiteBronze392]

That is about where I'm at but I have seen a brief 14 mpg on the highway as my best.

This was right in the sweet spot as I took all back road/highways averaging about 55-65mph

 

[MDrums]

I’m at 32/30 as well cold. Does a cold 28 set the dash warning ?

yes ..its 27 or 28 (I forget) psi will trigger low tire warning

 

[kylebw7]

Mine is at 45 warm. Averaging 12mpg. Dash was reading 13mpg at 80mph on the highway over the weekend. Guess I’ll lower them but my mileage is atrocious.

 

[NK2U]

Really don’t understand the low tire pressures for street use, they make the steering/handling sluggish and sloppy.

I run 37-38 psi, get 16.5 mpg, and it rides, steers, and handles fine.

Same here. Steering is better too for street use.

 

[Jeepstin392]

Mine is at 45 warm. Averaging 12mpg. Dash was reading 13mpg at 80mph on the highway over the weekend. Guess I’ll lower them but my mileage is atrocious.

Gearing? Or a lot of throttle work?

 

[CAMEL2R]

32 PSI all around...not sure on the MPG, will have to pay attention next time. The way I drive, I prefer handling over MPG....and maybe bigger brakes. Say 37x12.5R20 on GC Trackhawk wheels and Monster Brembo's...sorry getting off topic there...giggity!

 

[Shark01]

The way I drive, I prefer handling over MPG....

Same here, which is why I run 37-38 psi on the street…..the mileage improvement is just a side benefit

 

[CAMEL2R]

Same here, which is why I run 37-38 psi on the street…..the mileage improvement is just a side benefit

Interesting...I found the higher the PSI, the more it darts around and is way to squirrely for me. I like 32 so it feels planted. Plus I think tire wear takes a hit as at those pressures, the side tread doesn't touch the ground.

 

[MDrums]

@Shark01 ....At 37-38 psi cold you will be at 41/42 psi hot and much less tire on the road thus WORSE traction/handling. Lower psi's to a point provide more tire on the road and much better traction and handling. This applies to any vehicle/tire.