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Old 03-05-2016, 08:29 AM   #1
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New 10 ply tires help

My 2007 Chev suburban says to have 35lbs PSI for standard tires. I bought TOYA 10 plys for safety and the ride is not real good until it warms up the tires and they stop bouncing. But the gas mileage went out the door. Why such a change in gas mileage? The tires call for a much higher PSI that 35lbs that the dealer put in them. If I raise that up will my mileage get better and will the car computer go nuts because it is higher than it calls for.
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Old 03-05-2016, 08:38 AM   #2
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you need to run the pressure the tire says, or at least very close too it. Mileage will probably not go up, and the ride will be worse. Tires are much heavier and stiffer, but that's what's needed to handle towing safely. The tire sensors can be retrained I believe.
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Old 03-05-2016, 08:42 AM   #3
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You went from a P metric to a LT tire? Did you change wheels too? Those wheels on your 1500 Suburban likely do not have the raring to handle much more pressure than what the tire dealer put in them.
What size did you put on vs what was on it? That likely has fooled your lie o meter which I suspect your using for your fuel economy numbers.
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Old 03-05-2016, 08:45 AM   #4
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heavier tires will effect mileage. Lots more weight to get spinning. Even if size is the same.
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Old 03-05-2016, 08:48 AM   #5
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Quote:
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heavier tires will effect mileage. Lots more weight to get spinning. Even if size is the same.
Exactly! More rotational inertia.
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Old 03-05-2016, 05:48 PM   #6
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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
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Old 03-05-2016, 05:52 PM   #7
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The tires call for a much higher PSI that 35lbs that the dealer put in them.
Am I understanding correct that you are currently running 35 psi in a 10 ply rated tire?
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Old 03-05-2016, 06:37 PM   #8
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This article may help explain my question above. If you can verify my question above, we can go from there:

Tire Types: Tire Load Capacities & Pressure for Euro-metric, P-metric Tires

the main jist of which is this:

'Size-for-size, compared to P-metric tires, LT tires require higher air pressures to carry equivalent loads.'

We'll need to examine your derated OE P-Metric size that you took off your truck, and see what LT size you put on, to actually find out if the above applies to your scenario.
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Old 03-05-2016, 09:51 PM   #9
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Yes that's what the dealer put in them. He said to raise the pressure when pulling a TT. Didn't make sense to me......
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Old 03-05-2016, 09:57 PM   #10
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Yes that's what the dealer put in them. He said to raise the pressure when pulling a TT. Didn't make sense to me......
OK, we need to look into this further. If your truck is handy, can you open the driver side door, and look on the jamb (but it can be on the door itself). There should be a tag there that states the OE tire size and air pressure (front and rear). Can you note this along with the weights on the tag, and then also note the 10 ply tire you purchased, and the size of it.

I can get you the correct info from all of that.

Thanks.
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