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On my car I felt the 215's it came with were too wide sacrificing snow traction, I went from 215/60/15(129mm high sidewall) to 205/65/15 (133 sidewall) 1% taller tire, I did it a tire or 2 at a time so never saw any FE change. But snow traction is better using the same make model tires. I may go to 195/70 next depending on what tires I find.
Some shops won't mount anything but factory size, I carry mine home and mount them myself. Other option is to carry in wheels, they might mount anysize that way.
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