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Old 03-06-2016, 10:02 AM   #21
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OOooooffff! 3MPG??? I'm going to rethink my plans.

I tow about 20% of my total mileage. I don't think that sacrifice would be worth it for my situation.
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Old 03-06-2016, 10:20 AM   #22
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OOooooffff! 3MPG??? I'm going to rethink my plans.

I tow about 20% of my total mileage. I don't think that sacrifice would be worth it for my situation.
I thought the Maxtow EcoBoosts already had LT tires?
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Old 03-06-2016, 10:30 AM   #23
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No...crazy. A max tow rating of 11,300 on P rated tires!
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Old 03-06-2016, 10:50 AM   #24
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To the OP, I had something come up and will be out of pocket for this morning. When I get back home, I will better explain the following links from Firestone and Toyo on the air pressures when going from an Original Equipment P tire to a LT tire as you have done.

Quick glancing at the numbers in their guides, you need no less than around 42 pounds to get your new tires carrying capacity BACK up to what you took off.

I'll get into more detail later, but here is some reading for all. I like the Firestone one better as it has an easy to follow worksheet.

http://www.tiresafety.com/images/tir...t%20manual.pdf

https://toyotires2-1524598101.netdna...s_20151020.pdf

P.S. I'll also touch on the TPMS question which can have the thresh hold pressures changed. On a GM product, you may have the TPMS light come on with over pressure as well as under pressure. I don't know if your tire dealer explained that to you.
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Old 03-06-2016, 11:03 AM   #25
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Yes. I switched my 2011 F150 to 10 ply and lost 3 litres per 100. But that are great for toeing. Much more sure footed
x2 Ride wa
s hard too
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Old 03-06-2016, 11:05 AM   #26
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Put 55 in and call it a day. This will give you just over a LT 'C' load rating which is plenty for your truck, without the ride being too harsh.


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Old 03-06-2016, 11:53 AM   #27
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You went from a max 44psi P tire to an 80psi E tire, correct? If so, you need to increase PSI unloaded to 45-50psi or so because what's on your door sticker no longer applies, and perhaps up to 80psi when towing. Yes, they will ride harder at max PSI but you definitely don't have to run max when not towing. As long as the new tires are the same diameter as the old tires, your onboard computer should adjust to decreased/increased mileage. I suspect you'll see slightly higher mpg from the harder tire because of less rolling resistance. Other than making sure your wheels can handle 80psi, you've made a good decision.
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Old 03-06-2016, 12:49 PM   #28
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There is no reason to put 80lbs in these tires, ever.

It would be helpful to post the tire specs and your rear axle rating so a load range chart can be used to determine a good maximum tire pressure to use.


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Old 03-06-2016, 12:58 PM   #29
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To be of any use to you the tires need to carry 80PSI. But sadly your wheels probably cannot handle that pressure. Lets face it,you got the wrong tires for your SUV. Dealer should never have sold them or installed them on your vehicle.
??
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Old 03-06-2016, 01:20 PM   #30
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Tire pressure chart

https://toyotires2-1524598101.netdna...s_20151020.pdf
Try this link it's for Toyo tires but should work for any brand. A lot of good information.
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