Though Nokian's Hakkapeliitta R snow tires are Nokian's lowest rolling resistance, they are decidedly not the lowest RR tires on the market.
I believe that crown still belongs to the OE tire on the first-gen Insight, the Potenza RE92 in P165/65R14. Other sizes of the same tire are a different formulation.
I have yet to hear any substantive reports of an Insight owner getting better mileage or better coastdown tests with any other tire, so it's still the champion. Too bad it's only available in one size, and it's unavailable in Europe.
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