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Old 07-19-2012, 09:55 PM   #1
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Tires

The truck I bought came stock with 20" tires (michelin 275/65/20E) and it tows great. I am curious if 20" is better than 18" or does it really matter? Gas mileage worse or Better?
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Old 07-19-2012, 10:32 PM   #2
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Not a big deal. Some people prefer the look of 20's. Some people prefer the higher sidewall height of the 18's to provide extra cushion and shock protection under heavy loads. Depends on how you use your vehicle IMO.
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Old 07-20-2012, 01:07 AM   #3
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It can be a little bit of a game changer. If you keep the same aspect ratio, the 18" wheels will have a smaller diameter, therefore a smaller circumference. This will come out in the end to be less distance traveled per revolution with the smaller tire. You may lose some mileage (probably not too noticeable) and might need to get your speedo calibrated, but it might give better low end pull for towing. With the decreased rolling weight of the smaller rims, though, it might all come out in the wash with mileage since each pound of rotating weight you lose is equivalent to losing 10 lbs of static weight in terms of performance and mileage.
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Old 07-20-2012, 07:50 AM   #4
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Assuming you were to go to the 275/70 18 that Ford uses and you had 3.73's your axle ratio would change to abt an effective 3.83 as there is abt .9 inch difference in the diameter of the 2. Resulting in a bit more pulling power and as to mileage who knows maybe a bit better as I know going from LT265/70 17's to LT285/70 17's I took a mileage hit as they are bigger and wider. Although in your case they would both be the same width.
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Old 07-20-2012, 08:00 AM   #5
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Assuming you were to go to the 275/70 18 that Ford uses and you had 3.73's your axle ratio would change to abt an effective 3.83 as there is abt .9 inch difference in the diameter of the 2. Resulting in a bit more pulling power and as to mileage who knows maybe a bit better as I know going from LT265/70 17's to LT285/70 17's I took a mileage hit as they are bigger and wider. Although in your case they would both be the same width.
Don't think the width would have any effect on mileage as much as the diameter.
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Old 07-20-2012, 10:01 PM   #6
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just got these same tires for the Ram to replace the P275/60R20
I debated the same exact point and was result was, stay with the 20's, less bouncy than the 17, less sidewall.
Love these tires by the way! big improvement. The Wranglers HP felt squishy while towing.
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Old 07-20-2012, 10:23 PM   #7
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Don't think the width would have any effect on mileage as much as the diameter.
The weight of the tire will.... all things equal, a heavier tire will provide less MPG.

Check the specs on the tire.

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Old 07-20-2012, 10:30 PM   #8
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The weight of the tire will.... all things equal, a heavier tire will provide less MPG.

Check the specs on the tire.

Think one would be hard pressed to document the fuel mileage difference strictly dependant on weight of the tire, assuming all other dimensions were the same.
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Old 07-20-2012, 10:45 PM   #9
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Think one would be hard pressed to document the fuel mileage difference strictly dependant on weight of the tire, assuming all other dimensions were the same.
( all things equal ) A heavy tire = lower MPG. simple physics my boy.
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Old 07-20-2012, 11:22 PM   #10
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( all things equal ) A heavy tire = lower MPG. simple physics my boy.
Maybe if we're calculating fuel mileage to the second decimal place. Don't think I'll be putting tire weight at the top my list of tire requirements! We're talking heavy LT tires aren't we?

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