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Started By
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Tire pressure on truck tires question.
Posted on 10/24/16 at 8:56 pm
Posted on 10/24/16 at 8:56 pm
Was driving my truck in town the other day and my low tire pressure light came on. I drove the short distance to where I was going and checked the pressure in all 4 tires since my truck ('14 F-150 Crew Cab 4x4) doesn't tell you which tire is low. Recommended pressure inside the door says 34 psi. Front left was at 26 psi and the other 3 were at 30 psi. So I assume I've got a leak in the front left left and drive a couple blocks to a tire shop to have it plugged.
The guy jacks up the front left tire and sprays the whole tire twice with soapy water and no leak. Checks the stem, no leak. So he says it must be just low and he'll pump them all up and to keep an eye on it. So I tell him to put 40 psi in all 4 and he does. Mind you, recommended is 34 psi, but max on the tires is 44 psi.
So this weekend, I drive my truck to Grand Isle, and I'm getting 21.5 mpg at 70 mph where I normally get 18.5-19 mph at that speed. Couldn't belive 6 psi difference would make that big of a difference.
Problem is, from what I've read I'll shorten the life of my tires and get less braking if I keep the pressure higher than recommended.
Tire pressure recommendations
The guy jacks up the front left tire and sprays the whole tire twice with soapy water and no leak. Checks the stem, no leak. So he says it must be just low and he'll pump them all up and to keep an eye on it. So I tell him to put 40 psi in all 4 and he does. Mind you, recommended is 34 psi, but max on the tires is 44 psi.
So this weekend, I drive my truck to Grand Isle, and I'm getting 21.5 mpg at 70 mph where I normally get 18.5-19 mph at that speed. Couldn't belive 6 psi difference would make that big of a difference.
Problem is, from what I've read I'll shorten the life of my tires and get less braking if I keep the pressure higher than recommended.
Tire pressure recommendations
This post was edited on 10/24/16 at 9:19 pm
8
Posted on 10/24/16 at 9:05 pm to bhtigerfan
(no message)
This post was edited on 4/12/20 at 9:31 am
Posted on 10/24/16 at 9:20 pm to chalupa
quote:Same here, but damn what a difference in mpg that extra 5 psi makes.
I have always kept my truck tires at 35 psi.
2.5-3.0 mpg is a big damn difference.
This post was edited on 10/24/16 at 9:21 pm
Posted on 10/24/16 at 9:45 pm to bhtigerfan
quote:
Same here, but damn what a difference in mpg that extra 5 psi makes.
Now get it up over 100 and you're going to save a ton of fuel.
Posted on 10/24/16 at 9:46 pm to bhtigerfan
My 16 tells me exact psi on each tire. Anything less is ridiculous
Posted on 10/24/16 at 9:48 pm to chalupa
Lucky for me I already know which tire it is because I have to put air in it once a week, 
Posted on 10/24/16 at 10:18 pm to bhtigerfan
I couldn't find the leak on my f150 front tire. Turns out the alloy wheel had a little corrosion around the surface where the tire meets. Had it fixed and cleaned up at firestone for about $10
Posted on 10/24/16 at 11:29 pm to bhtigerfan
What the frick kind of tires you got where the max psi is 44?
If you are really worried about it, drive through a limestone parking lot and then onto pavement for a bit. If the limestone is off of the middle, the pressure is too high. If it is off of the outsides, pressure too low.
The braking and tire wear that website talks about is referring to the contact patch
If you are really worried about it, drive through a limestone parking lot and then onto pavement for a bit. If the limestone is off of the middle, the pressure is too high. If it is off of the outsides, pressure too low.
The braking and tire wear that website talks about is referring to the contact patch
Posted on 10/25/16 at 7:35 am to chalupa
quote:
I have always kept my truck tires at 35 psi.
+1
It also depends on a couple of other factors:
1. Is it a multi-ply tire? I run my BFG A/Ts at 35 psi where I used to run my BFG Rugged Terrains at 40. If you run a high-ply tire at a higher pressure you will get more axle jump over bumps and you don't want that when you're going down the highway at 80mph.
2. Keep in mind that your tires will increase by 1-4 psi once they reach operating temperature. Increases in temperature cause increases in pressure.
Posted on 10/25/16 at 7:53 am to bapple
I run Michelins on my 2015 Platinum at 37-38 psi and my max is also 44. Gets 20 to 20.5. My individual low tire indicators work fine. Did the 14 and lower just not have it?
Temp affects tire psi. You can have 35psi on a 90 degree day and cold front push thru and have 29psi at 41 degrees. Happened to me this past weekends front.
Temp affects tire psi. You can have 35psi on a 90 degree day and cold front push thru and have 29psi at 41 degrees. Happened to me this past weekends front.
Posted on 10/25/16 at 8:03 am to Hammertime
quote:Pirelli Scorpion ATR P275/55/R20, 44 psi max. They were on the truck when I bought it new.
What the frick kind of tires you got where the max psi is 44?
I do notice a little rougher ride with the extra 5 psi though.
Posted on 10/25/16 at 8:11 am to bhtigerfan
quote:
Couldn't belive 6 psi difference would make that big of a difference
Technically it was 8 and that's almost 25%. I think 40 PSI is too high; 36 should be your ceiling.
Posted on 10/25/16 at 8:29 am to bhtigerfan
That's weird. I figured they'd be LT tires instead of passenger tires because LT stands for light truck and P stands for passenger.
Posted on 10/25/16 at 8:29 am to Wtodd
It's actually a 5 psi difference. I thought recommended was 34, but it's 35 psi and they're now at 40.
Basically, my question is will it ruin or make my tires wear out faster with the extra 5 psi. I'm liking this gas mileage.
Basically, my question is will it ruin or make my tires wear out faster with the extra 5 psi. I'm liking this gas mileage.
Posted on 10/25/16 at 8:34 am to Hammertime
quote:Yeah, I thought the same thing when I first noticed it after I bought it. They're 6 ply tires.
That's weird. I figured they'd be LT tires instead of passenger tires because LT stands for light truck and P stands for passenger.
From Pirelli:
quote:
The Scorpion ATR is Pirelli's On-/Off-Road All-Terrain light truck tire developed for pickup, crossover and sport utility vehicle drivers that want to combine on-road civility with off-road capability. The Scorpion ATR is designed to master long highway journeys, wet roads and the challenges of winter driving by combining paved road comfort and handling with rough terrain grip and maneuverability.
This post was edited on 10/25/16 at 8:36 am
Posted on 10/25/16 at 8:39 am to bhtigerfan
I would first check if you may have run over a nail or something like that.
Get a tire gauge to check your tire psi then fill it up to the recommend psi
Get a tire gauge to check your tire psi then fill it up to the recommend psi
Posted on 10/25/16 at 8:43 am to bhtigerfan
Drive through a limestone parking lot like I suggested. That website is just talking about contact patch
Posted on 10/25/16 at 8:59 am to bhtigerfan
quote:
The guy jacks up the front left tire and sprays the whole tire twice with soapy water and no leak.
Be careful of this shite, soapy water doesn't alway find a leak. Still don't understand why places that deal with tires do not invest in a tire tank. They aren't expensive and they are full proof.
Posted on 10/25/16 at 9:12 am to bhtigerfan
My 2015 F150 recommended is 50 psi.... Look on inside of driver door not on tire.
Posted on 10/25/16 at 9:33 am to rilesrick
I looked it up because it was odd to me why a truck would have passenger tires. Some had the P-rated tires, and some had LT tires. Yours would be C load LT tires, which should be standard on a 1/2 ton truck. D should be on there if you tow.
I also saw that the passenger tires were only lasting like 20k on F150s. This happened to my dad twice, and I've noticed it happens to my mom's GL550 with P-rated tires also. That leads me to believe they are not designed or suitable for trucks and SUVs
Eta: Reading comments online from multiple lead engineers at different tire companies, they do not advise getting P-rated tires on a truck. This is a scam used by Ford to get better mpg and better ride, and the engineers hinted at it being unsafe
I also saw that the passenger tires were only lasting like 20k on F150s. This happened to my dad twice, and I've noticed it happens to my mom's GL550 with P-rated tires also. That leads me to believe they are not designed or suitable for trucks and SUVs
Eta: Reading comments online from multiple lead engineers at different tire companies, they do not advise getting P-rated tires on a truck. This is a scam used by Ford to get better mpg and better ride, and the engineers hinted at it being unsafe
This post was edited on 10/25/16 at 9:57 am
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