Tire Pressure
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Senior User
Joined: Jan 2009
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From: Central Florida
Tire Pressure
I am getting ready to leave for the summer and put about 7000-8000 miles on the Ex. This will be my first big trip with it, I will not be towing anything this year - next year will be a different story.
My questions: What is the best tire pressure to run at for highway drive with these trucks? Should I max out the tire for good mileage? Run it just below max pressure, say 5 psi? What are your thoughts and experiences?
When I purchased the Ex, it came with Michelin LTX L/S 285/75/R16, and have a max psi rating of 65 psi.
Thanks in advance.
My questions: What is the best tire pressure to run at for highway drive with these trucks? Should I max out the tire for good mileage? Run it just below max pressure, say 5 psi? What are your thoughts and experiences?
When I purchased the Ex, it came with Michelin LTX L/S 285/75/R16, and have a max psi rating of 65 psi.
Thanks in advance.
Post Fiend
Joined: May 2006
Posts: 10,007
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From: Central Florida
There is a threshold for max pressure and most comfortable. Maxed out tires can be a little bouncy and stiff. I find 10% under max makes a nice place to start. If it's bouncy, then drop them down. If you think you might get a little better mileage, add a pound or two.
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Senior User
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From: Central Florida
Thanks for the advice, gentlemen. My tires are currently at 50 psi all around. I may jack them up to around 55 front and 58-59 rear and see how that works on the highway. I will just have to adjust and readjust to find the right combination.
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Senior User
Joined: Jan 2009
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From: Central Florida
You must have E rated tires! I only have D's that came with the truck, brand new, from the dealer I bought it from. When these where low, I will get some E's!!
Elder User
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<~ runs full cold psi-which is 60 on my D's---great tire-great wear-great ride- 19.1 mpg on da highway
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Post Fiend
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Ds are fine unless you carry a lot of weight.
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Thread Starter
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Senior User
Joined: Jan 2009
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From: Central Florida
I will eventually be towing a 24-26 foot TT. Haven't purchased one yet, had to get the Ex first. But I will cross that bridge when the time comes. Thanks for the input.
Junior User
Joined: Jan 2004
Posts: 54
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From: Michigan
tire pressure
I run "E" on my truck with about 50 psi not towing, about 60-62 towing a 8000lb travel trailer. The tire guy said with the heavy diesel motor "E" is what he would run if his family was in the truck.
Post Fiend
Joined: Oct 2002
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I also believed the higher pressure for interstates thing...
even to the point of bringing my B&D air pump to adjust on the road.... but really didn't notice much diff in mpg ever...
my need for speed and acceleration affected mpg MUCH more
However, I do think the high pressures I ran may have helped me get 83K outta my original BFG's TA's before youse guys scared me about the sidewall cracking, still had miles left in the tread, even then !
even to the point of bringing my B&D air pump to adjust on the road.... but really didn't notice much diff in mpg ever...
my need for speed and acceleration affected mpg MUCH more
However, I do think the high pressures I ran may have helped me get 83K outta my original BFG's TA's before youse guys scared me about the sidewall cracking, still had miles left in the tread, even then !
Elder User
Joined: Dec 2006
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not clear why anyone would run more than 50 - 55 lbs. At those pressures, you still have a cushion of air between your vehicle and the road.
Tires, and their ability to absorb road shocks, are part of the calculations for a vehicle's suspension system. If you get the tire so hard that it isnt going to flex around incoming shock-loads, you risk cord damage, and excess loadings on EVERYTHING from the rims to your fanny.
Tires, and their ability to absorb road shocks, are part of the calculations for a vehicle's suspension system. If you get the tire so hard that it isnt going to flex around incoming shock-loads, you risk cord damage, and excess loadings on EVERYTHING from the rims to your fanny.