Quote:
Originally Posted by euromodder
The EU rating is not absolute , but relative …..
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No, I don't think so. The grade is determined by the RRC (Rolling Resistance Coefficient), which is determined by a test.
Quote:
Originally Posted by euromodder
….."Same" tyre, but with an XL load rating will often return a better FE rating ……..
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That only means that the test gets a different result if the tire is different - one of the peculiarities of trying to do RR ratings. Size and Load Range are examples of "different" tires. The EU didn't try to address this in the regulation.
Quote:
Originally Posted by euromodder
…… For sensibly small tyre sizes, like 175/65/14 it's hard to find an A rated tyre - there's just one ... even though the tyres are modern.
205/55/16 ? A's aplenty ...
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Yup, larger tires get better RRC - and that is reflected in the ratings.