can i change tire size without effecting fuel economy? - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 05-08-2013, 09:16 PM Thread Starter
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can i change tire size without effecting fuel economy?

I have a 99 with 16s on and have been wondering what sizes can i consider without hurting economy. thought about 17s or 18 but wanted to hear from those who have made the change.

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post #2 of 6 Old 05-09-2013, 02:05 AM
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So, you are thinking about changing your wheel size, tire size, or both? Any changes you make that add weight to the truck is going to affect your fuel economy. How significant the change depends on how big you go.

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post #3 of 6 Old 05-09-2013, 02:39 AM
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plus if you go wider the extra width will hurt aerodynamics, and add resistance. (Even if the weight and diameter is the same)

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post #4 of 6 Old 05-09-2013, 03:09 AM
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You could go up to like a 285/75/16 tire size without hurting fuel economy. Once you get bigger wheels, the wheels weigh more than your stockers.

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post #5 of 6 Old 05-09-2013, 05:18 AM
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yea....go down in size will help it go up

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post #6 of 6 Old 05-09-2013, 10:00 AM
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With out going with bigger wheels 285x75r16 with 18s wheels 285x65r18. Both should give you better economy by lower gear ratio.

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