mpg change going from 18" to 20" wheels - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 07-15-2012, 06:11 PM Thread Starter
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mpg change going from 18" to 20" wheels

I'm thinking about staying with 18s and getting 295/70 vs going to 20s stock size. Anyone have any input. Pics of 18s with 295/70 would also be great.
Also since 20s weigh more do they knock down mpg more?
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post #2 of 6 Old 07-16-2012, 01:35 PM
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Good questions, I have 275-70-18 and am looking into 295-70-18. The bigger tire weighs ten pounds more, is ~1" wider and taller and ~$24.00 more in the Terra Grappler which is what I am considering going to this fall. I believe in my case I will pay dearly in MPG and price.

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post #3 of 6 Old 07-21-2012, 04:42 PM
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I went from 365/65-16 Toyos to 315/75-16 BFGs, my mpg stayed the same. That's 2 inches less tread width, not to mention the weight loss. However, when I went from 285/75s to the Toyos (33 to 35) I took it in the shorts for 2 mpg.

My point is this, if the tire is generally the same diameter +/- an inch, I seriously doubt you would see any mpg change. On top of that, if you're not dead on with your math, well, the error would compound itself.

18s, 20s, 16s, the real difference is the tire OD, not the wheel OD.

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post #4 of 6 Old 07-21-2012, 05:16 PM
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Quote:
Originally Posted by Karls03 View Post

My point is this, if the tire is generally the same diameter +/- an inch, I seriously doubt you would see any mpg change. On top of that, if you're not dead on with your math, well, the error would compound itself.

18s, 20s, 16s, the real difference is the tire OD, not the wheel OD.
I think the tire width affects the mpg more than the diameter.


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post #5 of 6 Old 07-23-2012, 05:35 AM
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Quote:
Originally Posted by jimmyv13 View Post
I think the tire width affects the mpg more than the diameter.
You may think that, but like I already said, my experience was otherwise. Going from 14.5s to 12.5s didn't change mine at all, and I was thinking it would.
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post #6 of 6 Old 08-11-2012, 08:57 AM
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Quote:
Originally Posted by Karls03 View Post
My point is this, if the tire is generally the same diameter +/- an inch, I seriously doubt you would see any mpg change. On top of that, if you're not dead on with your math, well, the error would compound itself.
Hit the nail on the head. If the same principal in stance/performance as my race cars are concerned, overall rolling diameter is really all that matters providing its the same tire. Obviously, a mudder vs a hiway tire will vary depending on tread/tirepressure etc.
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