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Rolling resistance can be bigger % change but the effect to fuel consumption is max 7-8% at least what I have seen in local magazines (been following the tests over 4 years perioid summer and winter tires) and they have usually one or two reference tires of chinese marks (non brand) just to see the level of their performance.
This years test had 16 tires and biggest difference was 6% to fuel consumption. and the suprice performer was Landsail LS288 which outrun few of the brand tires in some tests. That tire set reference price was 350€ 8.6 points of 10 vs winner Continental Contipremium Contact 5 550€ per set 9.5 of 10. tested size was 205/55R16
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