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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