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Discussion Starter #1
I put sum 215/35/18's on my xb and I need to know if I would need to have the speedometer adjusted or so since there is less revolutions for a cycle.
Is this affecting my gas mileage?
 

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Your speedo is off with that combination by less than 1% ( actually .8%)
When your doing 60 mph on speedo your actually going 60.5 mph. :D

If your tire wheel combination is heavier, which it probably is, it will effect your gas mileage.
 
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