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I think 1% deviation on the speedometer and odometer won't matter too much. I'd guess that the tires slip by at least that much in everyday driving. wrgraham, keep us updated on any other changes you notice. BTW, what brand/model of tire did you go with? It'll be a while before the ECHO needs new tires, but my sister's Civic is starting to look thin-treaded -- 185/60/14 would probably be the most appropriate size for that car too.