Tire recalabration...
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Senior User
Joined: Aug 2008
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Tire recalabration...
Everyone,
I changed my 2006 Ford F250 (5.4L) stock/factory rims & tires (265/70 R17) to 18 inch (275/70 R18). I was getting 12 miles per gallon and now I'm getting 10 miles per gallon. I just wanted to know if there is anyway to recalabrate the truck. I called tire shops around my area and they said they don't do this. I just wanted to know if there is any computer unit I can purchase to change this.
I just can't believe I lost 2 miles by changing the tires one size larger. I could see this happening if I changed to a 20 inch rim and tires.
Any help will do..
I changed my 2006 Ford F250 (5.4L) stock/factory rims & tires (265/70 R17) to 18 inch (275/70 R18). I was getting 12 miles per gallon and now I'm getting 10 miles per gallon. I just wanted to know if there is anyway to recalabrate the truck. I called tire shops around my area and they said they don't do this. I just wanted to know if there is any computer unit I can purchase to change this.
I just can't believe I lost 2 miles by changing the tires one size larger. I could see this happening if I changed to a 20 inch rim and tires.
Any help will do..
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Joined: Oct 2010
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From: Chicago
the only place that can change the tire size is ford unless you buy a tuner and then you can change the size your self. Now ford will charge a min of 1 hour of labor to change the tire size.
the reason for the lower gas millage is that your when your speedo show's say 60mph you are really going 63 mph.
Now the only other way is to change the tire size to a 265/65/18 that will be close to the same rev's per mile as the stock size.
the reason for the lower gas millage is that your when your speedo show's say 60mph you are really going 63 mph.
Now the only other way is to change the tire size to a 265/65/18 that will be close to the same rev's per mile as the stock size.
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Sorry for the late respond. So the only thing i need to do is to change my tire size from 275/70 R18 to 275/65 R18? This will make up the difference? I just want to make sure.
I know I will not put on any bigger tires or rims on my truck for now. Should I go to ford and ask them to recalabrate or should I just wait till I change my tires.
I know I will not put on any bigger tires or rims on my truck for now. Should I go to ford and ask them to recalabrate or should I just wait till I change my tires.
FTE Leadership Emeritus
Joined: Sep 2000
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From: Stephensville WI
There are a few reasons your mileage dropped.
First, your effective gearing changed.
Second, your truck is up higher and has more wind resistance.
Third, the new tires are wider and probably have more rolling resistance.
First, your effective gearing changed.
Second, your truck is up higher and has more wind resistance.
Third, the new tires are wider and probably have more rolling resistance.
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Joined: Oct 2010
Posts: 59
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From: Chicago
Sorry for the late respond. So the only thing i need to do is to change my tire size from 275/70 R18 to 275/65 R18? This will make up the difference? I just want to make sure.
I know I will not put on any bigger tires or rims on my truck for now. Should I go to ford and ask them to recalabrate or should I just wait till I change my tires.
I know I will not put on any bigger tires or rims on my truck for now. Should I go to ford and ask them to recalabrate or should I just wait till I change my tires.
the rev's per mile difference from stock to the 25/65R18 is .1
the rev's per mile difference from stock to what you have now 275/70R18 is 2.9
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Joined: Aug 2008
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Again my old stock rims were 17 inch and steel. Then I purchased a set of 18" alloy rims and tires a month ago on craigslist. The tires still had 80 percent treads on it. It came off from a Ford F350 and they really look good on my truck.
I know I'm not going to go larger then 18 inch. So I guess I will go to ford and get this re-calabrated. This way when it's time to change tires I can get the same size.
Thanks for all the information.
I know I'm not going to go larger then 18 inch. So I guess I will go to ford and get this re-calabrated. This way when it's time to change tires I can get the same size.
Thanks for all the information.
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