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Hard to say regarding tire comparison. Nobody really does apples to apples comparisons of tires, especially where fuel economy is concerned. It's well documented that in the G1 Insight, it's typical to lose 15-20% economy by using most off the shelf non-LRR tires, whereas Energy Savers, Ensaves and the stock Potenza RE92's return pretty similar economy. The lost economy also shows up in performance, hurting acceleration, which to me is a lot of tradeoff.
I want to say it was MetroMPG on this forum that did some roll-down testing with various tires at various pressures, maybe they'll chime in.
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