Did your tire diameter change? - Saab 9-3SS Bulletin Board - Saabnet.com
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Did your tire diameter change?
Posted by Jim Moore [Email] (more from Jim Moore) on Fri, 9 May 2008 19:56:01
In Reply to: Adjust your odometer? n/m, SeeVTSaab, Fri, 9 May 2008 11:22:49
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Depending on the before and after tire sizes, your tire diameter may have changed enough to be causing at least some of this perceived loss of gas mileage. If the new tires have a larger diameter, than you're actually getting better MPG than your calculations would suggest, because you are actually traveling further (and faster) that what your odometer (and speedometer) show. This can be compensated for with a Tech-II session at a dealership.
You can calculate this error very easily using an online tire calculator as long as you have the proper tire size callout for both tires.
posted by 71.232.19...
Tire Size Calculator
Posts in this Thread:
- 17" Rims lower gas milage??, Brian, Fri, 9 May 2008 09:40:31
- Re: 17" Rims lower gas milage??, jay, Tue, 20 May 2008 12:11:14
- Wider, softer rubber, and heavier wheel/tire combo..., Caarma , Fri, 9 May 2008 12:33:54
- Adjust your odometer? n/m, SeeVTSaab, Fri, 9 May 2008 11:22:49
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