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You can still drive to lower fuel consumption that the eu tests proves that it still can be off up to 40% like I mentioned before. Car manufacturer gives the Cd value for the tests and some test facility does the tests on the car.
On the tires I believe at the moment the tire manufacturer does the test in their own laboratory and stamps the results in the tires as they like. No one confirms those values at the moment. There is a company in Finland which will start to test those tires in their independed laboratory.
Reason why you cannot find Nokian tires on any cars OEM tire is that putting their tires to first installation tires is not very good business for manufacturers. You get much better ROI from selling only to aftermaket sector. Also German and France like to buy the tires from closer and their own couyntry so its hard to compete with them with those small margins.
I am not saying that continental ecocontact 5 is not a good overall tire it sure is. I will not believe that its the best LRR tire out there. Reasons for that is many. In general winter tires have better rolling resistance factors. Nokian Hakkapeliitta R has won (or in some tests come second) the LRR tire test in the last four years in a row in many car magazines.
Why it is not in every hypermilers car is still unclear for me. That I know that almost every winning hypermiler racers use the all aroung the world. One reason can be that they havent never heard about the Nokian tires.
I try to find some tire tests from last summer to see how good the ecocontact 5 did on LRR test section.
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