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I have Continental Viking Contact 5 northern europe versions, compared to ordinary summer tyres these are a lot better, actually all winners of ecorun competitions here use similar tires instead of summer tires or LRR tires because these have even lower rolling resistance.
Compared to typical winter tires fuel consumption is around 25% less. Of course difficult to find in US and these don't really work in heat, tend to melt if very hot weather.
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