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Old 05-04-2022, 12:43 AM   #27 (permalink)
Master EcoModder
Join Date: Aug 2018
Location: USA
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Jeep - '97 Jeep Cherokee Sport
90 day: 19.36 mpg (US)

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Originally Posted by hayden55 View Post
"mpg from 265/65/17 to 245/75/17LRR was about 5%"

But yes my main point is mpg is gained by reducing width and friction
265 STD -> 245 LRR
and if you're vehicle isn't geared numerically low enough going to a taller tire helps.
I think I have found the perfect solution. My Sequoia has the tow package, which means that it has a 4.30:1 gear ratio in the differential. The regular Sequoias have a 3.90:1 gear ratio that I could get.

I would want to keep the overall ratio close to stock (to retain towing capacity), so I will reduce my tire size.

My stock tire size has a 31.8" diameter and it has a 275mm width. I would need to go down to 29" for gearing to stay unchanged.

I don't want my tires to be too small, so I found a 30" tire to suit my needs. The 255 65r17 tires are much skinnier and they are eco-focused. When paired with the 17" wheels I found, the overall weight goes from 80lbs down to 57 lbs, a 23 lb difference! That would be a total of 92 lbs of rotating mass removed from the car.

I think this is the most optimal tire/wheel/gear combination that is possible with the Sequoia, and I think it would net substantial mpg gains.
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