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You can look at my threads below in my signature box.
I went from 245/45/18 to a 50 series tire...same make and model. Kohmos.
It was about a 5% increase in height.
I picked up more mpgs.
some rules:'
1. you need to spend about 60% of your driving at cruise.
2. stop and go driving does not help w taller tires
3. I found zero lack of power when I went tall. but I tend to drive easy and not in a hurry.
4. try to buy the best lowest rolling resistance possible (but you should do this anyway!)
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