Many factors can lead to premature tire wear, but I doubt the roundabouts played much of a role. Worn out suspension, front end alignment, wheel balance, failure to rotate, and improper inflation can all lead to early wear. A combination of those factors can multiply the wear. Have you checked the actual tread depth? What about the wear pattern? A tire worn more toward the edges as opposed to the center would indicate underinflation. A tech who knows hoe to "read" the wear pattern can tell you a lot about the underlying reasons.
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