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Old 08-03-2010, 02:26 PM   #3 (permalink)
honestabe
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Join Date: May 2010
Location: Mt Vernon, WA
Posts: 135

Black Knight - '08 Toyota Yaris
90 day: 35.39 mpg (US)
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Daox, the resistance difference between the 155/80 and 175/70 is significant. By my calculations, 4 175/70's are as wide as 5 155/80's. That's like driving around with a dual rear wheel setup on 1 side of the rear. And for someone who drives as much as I do, that's significant. IIRC I'm losing 3-5 MPG by having the 175/70 tires vs 155/80 tires.
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