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I remember a basjoos post where he discussed this. He had wide tires that were lower rolling resistance than skinny tires. In a stock car, using the skinny tires was more efficient because they create less aero-drag; however, in his well-skirted car, the tires did not affect airflow very much, so wider, lower rolling resistance tires were more fuel efficient. You'd really need to look at the specs of two given tires in comparison rather than just assuming narrower is more or less rolling resistant.
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