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I can't speak for tires at large. I'd like to, and I've looked for data, don't get me wrong.
My personal experience: In the 14" size, Michelin Defenders, which are relatively new, perform no better than the 16 year old RE92's. Most Insight owners agree they're worse, but it's marginal at best. They do last 2-3x as long, at the expense of being (subjectively) a bit more noisy.
My winter tires, Nokian Nordmans, are not rated for low rolling resistance, but I've seen 100mpg @ 50mph during the winter with the car fully warmed up, which is basically what I get with RE92's in the summer.
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