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  #13  
Old 01-19-2014, 10:38 PM
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Re: larger tire effect on odometer and mpg computer?

Thank you very much for the help.
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Old 01-19-2014, 10:43 PM
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Quote:
Originally Posted by Goonbash View Post
I know my speedo is now slightly inaccurate with the larger tires (reads slightly lower than actual road speed). Do any of you high tech guys know if this also effects the odometer? Seems like it might not clock miles quite as quickly as it should if it is based on the speedo, or is the odo based on gps or something where it is still accurate?

also is the onboard gas mileage and "range" calculation based on actual fuel consumption in which case it would still be accurate or is it based on tire revolutions or something that would now make it inaccurate?

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MPG will be effected
The larger the tyre the more effort it is for the engine to push
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Old 01-19-2014, 10:49 PM
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Re: larger tire effect on odometer and mpg computer?

Thanks. I know the larger tires will make mpg worse. They also lift the car 3/4 of an inch so it will be less aerodynamic. What i was wondering is if the onboard mileage computer that gives mpg in the evic is accurate with the new tire size or if the mpg reading in the evic is 5% worse than i am truly getting due to the larger tire circumference not being accounted for in the calculations.
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Old 01-20-2014, 08:17 PM
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Re: larger tire effect on odometer and mpg computer?

checked today on a 2014 GC summit. there are several available tire size choices that can be programmed into the BCM, however, none of them even come close to 275/65R18.
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Old 01-20-2014, 08:21 PM
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Re: larger tire effect on odometer and mpg computer?

Thanks a lot for checking. Any of them larger diameter than the stock 265/60/18 mine came with?
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Old 01-20-2014, 08:41 PM
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No. All were slightly smaller.
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Old 01-21-2014, 04:37 PM
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Quote:
Originally Posted by fnkychkn View Post
checked today on a 2014 GC summit. there are several available tire size choices that can be programmed into the BCM, however, none of them even come close to 275/65R18.
What about a 285/60-18? Is that a choice?
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Old 01-21-2014, 09:20 PM
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Re: larger tire effect on odometer and mpg computer?

Quote:
Originally Posted by My1stJGC View Post
What about a 285/60-18? Is that a choice?
no, all available choices were slightly smaller than the original 265/60R18.
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