Nokian Hakkapeliitta R is still the lowest rolling resistance LRR model from nokian tires and almost any tire out there. That new Nokian summer tire model is coming but at the moment it compromises too much grip and other driving properties.
Metro:
Have you tried to go asking few random companies can you go there to do that kind of test? If it is a company which has lots of cars they might give you a permit for your tests.
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