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I spoke with an engineer from Continental / General today and he was able to enlighten me further on this subject.
As I suspected, industry is fighting the labeling requirements tooth and nail and implementation dates have been pushed back.
Second, there is no one size fits all answer because of the way cars and trucks have evolved to the use of completely computer controlled drivetrains. Computerized systems are built and tuned to expect specific tire sizes and inflations so that the traction control, emergency brake assist, ABS, etc., etc., all work as planned.
My truck was built 19 years ago, and doesn't have much more than rear anti-lock brakes, so it is a different animal altogether.
He did offer the opinion, however, that other things being equal, a narrower tread width and smaller contact patch would likely have a lower rolling resistance than a larger tire. Lighter weight tires also tend to produce better fuel economy.
But as the current state of regulation has not forced the company to publish this information for consumers, specific CRR values for specific tires are considered to be trade secrets and cannot be revealed.
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