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Speedometer Vs Odometer

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Old Jul 30, 2022 | 08:36 AM
  #16  
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Interesting that the 285s overshot your speedometer a little. The 235/85 are interesting to me too, I imagine they would be a tiny bit better for mileage than my current 265s and I can add about 1/4” of height to possibly make my odometer a little more accurate. I had the same thought about snow but it doesn’t make much of a difference to me either being in Texas
 
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Old Jul 30, 2022 | 12:57 PM
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From: Ponca City, OK
Originally Posted by MARCSPSD
Excursion 2001 PSD 4x4 3.73

On my truck the fuel milage is about the same, but the tires seem to last longer. (no towing or hauling)

I would not go back to the 265's personally. But the 235/85/16 seem interesting. I did not check but guess the 265/85/16 are not a common size. I don't drive in snow but wonder if the narrow tires would be better in the snow. (My truck never has been in winter conditions as I live in FL and rarely drive out of state.)
The 235/85R16 are just a hair taller than the 265/75R16 but about an inch narrower. They are the old school F250/350 size. Common through the 80's and 90's, and probably earlier than that. Personally I prefer the tall skinny look but also think they may help mpg. Narrower tread pattern means less contact area, means less rolling resistance. At least that's how I play it in my head. I imagine an argument could be made they would wear faster, putting the same load/stress/miles on to a smaller area causing faster wear. I'm sure tread composition is really the major factor in tread life though. I currently have a set of commercial Falken GI388 7.50R16 14ply radials on my truck. These are the narrowest I have ever run and am seeing the best wear patterns and tread life of any tire I've tried yet. My truck is a heavy ol' girl though, a E99 F250 4x4 auto ext. long flat bed loaded down w/ tools, torch, small welder and compressor. Her normal rolling around wt. is 10k.
 
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